The upgrade that changes the marks more than the barbecue does · review
Two half-moon cast iron grates plus four supports, so half a kettle can be cast iron and half anything else.
What we would actually buy Two half-moon grates and four support extensions, so one half of a Weber kettle can be cast iron and the other anything you like. It also carries the only genuinely expert advice on this shelf: leave the dampers open so condensation does not collect.
“Leave the dampers open a bit so that condensation does not collect in the grill.”
Nobody else here makes the connection, and the mechanism is exactly right.
A kettle closed up tight after a cook holds warm, damp air — from the food, from the fuel, from whatever washing you did. As it cools overnight, that moisture condenses on the coldest surfaces in the grill, which are the metal grates, and it sits on them until morning.
Bare cast iron rusts in hours under standing water. COGRICHBF on this shelf puts the figure at 10 to 15 minutes.
Cracking the dampers lets the air exchange instead of sweating.
The other five tips are the standard routine, and worth having in one place: scrape after each use, oil after each use, lid on when not in use, cover on, and for long storage coat heavily in oil, wrap in plastic and store under the cover.
Set that against QuliMetal on this shelf, which claims its bare cast iron won’t chip or rust easily and publishes no care instructions at all.
So the kettle can do two things at once.
One half cast iron for searing; the other half the original stainless or porcelain grate, a griddle, or a Gourmet BBQ System insert. Mix and match from a range of surfaces to suit any need or style.
The four support extensions are what make it possible: they greatly increase the support surface, so a heavy half-moon designed for a kamado sits properly on a Weber — and the listing says they also suit the original stainless or porcelain grate, so they are useful even when the cast iron is out.
The alternative here is the Aura grate at $79.97: one solid 21.5-inch round, no seam, no gap down the middle. Simpler, if you want the whole kettle to sear.
Needs to be seasoned well in grill before use or everything sticks.
The finish is never stated — but that sentence settles it. You do not season porcelain enamel; there is nothing on glass for oil to bond to.
So this is bare cast iron, like the COGRICHBF and QuliMetal grates. The other five on this shelf are coated and need no seasoning.
The method is published: oil the surface, bring the grate up to cooking temperature, and only then put food on it.
A 22-inch circle is roughly 380 square inches, which puts this at about 21 cents a square inch:
Three times the Direct Store set. What the money buys is the modularity and the supports, neither of which the cheaper sets offer.
No weight published, so the casting thickness cannot be placed against the grates that publish one — 10.0 to 18.1 grams per square inch across this shelf. No warranty.
On sale at around $80 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 4 October 2026. The live price is at the top of the page.
| Package | TWO half moon grates plus FOUR support extensions |
|---|---|
| Size | For 22 in and 22.5 in Weber kettle grills |
| Fits | Weber Gourmet BBQ System gas grills such as 7587 and 7586, and 22.5 in charcoal grills such as 8835 |
| The supports | Increase the support surface, and also suit the original stainless or porcelain-coated grate |
| Why half-moons | You can mix and match cooking surfaces across the two halves |
| Seasoning | Must be seasoned in the grill before use, or food sticks |
| Seasoning method | Oil the surface and bring the grate up to cooking temperature before putting food on |
| Rust tip 1 | Scrape the grates after each use |
| Rust tip 2 | Season them by brushing with oil after each use |
| Rust tip 3 | Leave the dampers open a little so condensation does not collect in the grill |
| Rust tips 4–6 | Put the lid back on when not in use; cover the grill; for long storage, coat heavily in oil, wrap in plastic and store covered |
| Cost per square inch | About $0.210, taking a 22 in circle as 380 sq in |
| Dimensions | 203 × 254 × 25 mm (7.99 × 10 × 0.98 in) |
| Weight | Not published by the maker |
| Finish | Not stated as coated — the seasoning instruction implies bare cast iron |
| Amazon reference | B0GQRJ2JKL |
| EAN | 0637609850363 |
So the kettle can do two things at once, and KAMaster is the only listing here built around that. Two half-circles mean one half can be cast iron while the other half carries the original stainless or porcelain grate, a griddle, or a Gourmet BBQ System insert — the listing calls it "mix and match from a range of surfaces to suit any need or style". The four support extensions are what make it work: they "greatly increase the support surface" so that a heavy cast-iron half-moon designed for a kamado will sit properly on a Weber, and the listing says they also suit "the original stainless steel grate or porcelain coated grate". The alternative on this shelf is the Aura grate at $79.97 — a single solid 21.5-inch round with no seam, which is the simpler choice if you want the whole kettle to sear.
It is the best piece of advice on this shelf, and nobody else makes the connection. KAMaster’s third tip: "Leave the dampers open a bit so that condensation does not collect in the grill." Here is why it works. A kettle grill closed up tight after a cook contains warm, damp air — from the food, from the fuel, from the washing. As it cools overnight that moisture condenses on the coldest surfaces, which are the metal grates, and sits there. Bare cast iron rusts in a matter of hours in standing water; COGRICHBF on this shelf puts the limit at 10 to 15 minutes. Cracking the dampers lets that air exchange instead of sweating. The remaining tips are the standard routine: scrape after each use, oil after each use, lid on, cover on, and for long storage coat heavily in oil and wrap.
Yes, and KAMaster is admirably blunt: "Needs to be seasoned well in grill before use or everything sticks, and warm up for longer durability." The method is published too: "Apply cooking oil on the surface of the cast iron grate and allow the grate to come up to cooking temperature before placing any food upon it." That instruction tells you something the specification does not — this is bare cast iron, not porcelain-coated. Five grates on this shelf are coated (Direct Store, Aura, EasiBBQ, Broil King, both Webers) and need no seasoning; two are plainly bare (COGRICHBF, QuliMetal) and this is the third. Bare iron sears harder and chips not at all, and in exchange it has to be oiled after every cook.
Close prices, same category: comparable cookware and knives. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Size | Cost per square inch | Weight |
|---|---|---|---|---|
| KAMaster WRBY22 | $80 | For 22 in and 22.5 in Weber kettle grills | About $0.210, taking a 22 in circle as 380 sq in | Not published by the maker |
| Aura outdoor products AOP-CI22 | $80 | 21.5 × 0.5 in — a round grate for 22 in kettles, about 363 sq in | $0.220 | 3629 g (128 oz) |
| EasiBBQ DGO-Grate | $40 | 15.8 × 10.5 in each — about 332 sq in in total | $0.120 | 6019 g (212.3 oz) |
| QuliMetal QM-EU-KAOW-CG | $40 | 17.5 × 11.9 in each; 17.5 × 23.8 in as a set — about 417 sq in | $0.096 | Not published by the maker |
A Weber 22 kettle you want to run two ways at once — sear on one half, anything on the other
Specifications: the manufacturer sheet for cookware and kitchen knives and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
A 21.5 in round cast iron cooking grate 0.5 in deep for 22 in kettle grills, with a porcelain enamel coating, for Weber Kettle, RecTeq Bullseye and barrel grills
A 21.5 in round cast iron grate for a 22-inch kettle, at 3629 g (128 oz) — the lightest casting here.
Best for: A 22-inch Weber kettle, if you want one solid casting rather than two half-moons
≈ $80
One porcelain-coated cast iron cooking grid, 17.5 × 6.17 in, reversible with a pointed side for searing marks and a concave side to channel juices, for Baron 300/400/500 (2013+) and Crown 300/400/500 (2012+)
A reversible porcelain-coated grid — pointed for sear marks, concave to vaporize the juices.
Best for: A Broil King Baron or Crown, where the reversible faces are worth buying several of
≈ $21
A 2-pack of matte cast iron cooking grates, 17 × 13-1/4 in each and 17 × 26-1/2 in in total, for Nexgrill, Charbroil, Expert Grill, Cuisinart, Kenmore, Members Mark, Uberhaus, Uniflame and K-Mart grills
Two matte bare cast iron grates totaling 450 square inches, with a published standing-water limit.
Best for: A Nexgrill or Expert Grill, for anyone willing to oil the grates after every cook
≈ $36
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
