4-1/2" x .045", cutting abrasive wheel, x-lock arbor, type 27a (iso 42), 60 grit, fast metal/stainless, faster, fixed mount & high quality aluminum oxide grit, features snap on mounting & a wheel-release lever on grinder for 5x faster change out, wheel mounts properly without the need for a spanner wrench or flange nuts, no easy to lose parts, backward compatible with standard 7/8" arbor mounts, resinoid bonds are specially formulated with multiple layers of stranded fiberglass & aluminum oxide grit for speed & durability, application focused designed specifically for fast material removal with an easy-to-understand color-coding system & use with small angle grinder, precision manufacturing optimized wheels for less vibration & improved working speed.