7" Ceramic Cup Wheel 400 Grit

- Ceramic-bond diamond cup wheel for fine concrete edgework — built on a 7" cup format for use with 7"-rated hand grinders and walk-behind edge machines. The ceramic bond removes material cleanly without the glazing and deep gouging that metal-bond cup wheels leave behind, blending the edge perimeter seamlessly with the main floor finish.

- Fine-grit refinement step in the edge polishing sequence — the 400 grit sits in the transitional polishing range, used after coarser cuts (30, 50, 100, 270) to refine the edge surface and prepare it for resin polishing pads. On softer concrete, contractors can often transition directly from a 400-grit ceramic cup to a 400-grit resin pad without an intermediate step.

- Larger 7" footprint for faster edge coverage — the wider diameter removes material faster than the 5" version of the same wheel, making it the preferred choice on larger commercial slabs and longer perimeter runs. The trade-off is a lower maximum operating RPM, so always verify your grinder's rated speed against the max RPM marked on the wheel.

- 5/8"-11 threaded mounting for direct grinder fit — installs on most 7"-rated hand grinders and walk-behind edgers without an adapter, flange, or backing pad. Suitable for both wet and dry grinding conditions, though dust shrouds plus a HEPA vacuum are required for indoor work under OSHA silica standard 29 CFR 1926.1153.

- Part of a complete edge polishing system — pairs with coarser ceramic cup wheels (30, 50, 100, 270 grit) and finer ones (800 grit) to build a full edge progression that matches the main-floor polishing sequence. Choosing all ceramic-bond wheels for the edge avoids the scratch-chasing that happens when mixing metal-bond and ceramic-bond tooling in the same job.