QuliMetal Cast Iron Grill Grates Replacement for Weber Spirit 300 Series — 2‑Piece Set, Heavy‑Duty Heat Retention

QuliMetal 7638/7639 are heavy‑duty cast iron replacement grill grates engineered to fit Weber Spirit 300 Series, select Spirit II/GS4 models, and many Genesis Silver/Gold/Platinum grills for consistent searing and long service life.

These two-piece cast iron grates are sized and shaped to be a direct swap for common Weber part numbers and a wide range of Spirit and Genesis gas grills. Built for intense heat retention and even cooking, they’re sold as a matched set that covers the full cooking area of compatible three‑burner Weber-style grills. Below you’ll find clear answers to the questions most buyers ask when replacing grill grates.

Will these grates fit my Weber Spirit 300 or Spirit II grill?

Yes — the QuliMetal 7638/7639 set is designed to match the footprint of many Spirit 300 Series and select Spirit II/GS4 models. They directly replace common Weber part numbers and will fit most three‑burner Spirit cookboxes sized around 17.5 x 11.9 inches per half.

• Compatible with Spirit E/S310, E/S315, E320, E330, S320/S330 and Spirit 700
• Fits Genesis Silver B/C, Gold B/C (2002+), Genesis 1000–3500 and Platinum (2000–2010)
• Not compatible with Genesis Silver A or some Genesis II LX models
• Also usable on Weber SmokeFire EX4/EX6 pellet grills where dimensions match

How do these cast iron grates perform compared with enamel or stainless options?

Cast iron excels at holding and spreading heat, producing consistent temperatures across the surface and bold sear marks on proteins and vegetables. Compared with thin enamel or stainless racks, these grates deliver faster color development and improved caramelization at high heat.

• Superior heat retention for steady grills and better searing
• Durable, thicker construction resists warping under heavy use
• Won’t chip like enamel if dropped or knocked
• Requires seasoning and basic upkeep to prevent surface rust

What are the dimensions and how easy is installation?

Each half measures about 17.5 x 11.9 inches, combining to cover roughly 17.5 x 23.8 inches for a three‑burner cookbox. Installation is a simple swap: lift out the old grates and set these halves into the existing support ledges — no tools required in most grills.

• Individual grate: 17.5" x 11.9"; full cooking area: 17.5" x 23.8"
• Direct replacement for many Weber models (check part numbers and cookbox shape)
• Tool‑free install: drop into existing ledges and align
• Check compatibility notes for Genesis Silver A and some Genesis II LX variants

How should I care for and maintain these cast iron grates?

Cast iron performs best with routine seasoning to preserve the nonstick surface and prevent corrosion. After using the grill, clean off food residue while the grates are warm and reapply a thin layer of cooking oil; periodic deep seasoning keeps them performing and looking good.

• Brush or scrape off debris after each cook while warm
• Dry completely and apply a light oil coat to protect from rust
• Re‑season in‑grill or oven if surface becomes dull or food sticks
• Avoid soaking for long periods or using harsh chemical cleaners

Who is this set for? Grillers who want to upgrade to professional‑style cast iron performance without replacing their entire cookbox will appreciate these QuliMetal grates. They’re ideal for owners of compatible Weber Spirit and Genesis models who need thicker, longer‑lasting cooking surfaces for frequent high‑heat searing, backyard weekend cooks, or anyone seeking reproducible grill marks and even heat distribution. Verify your grill model and part numbers before ordering to ensure a proper fit.