The Makita X-LOCK 4-1/2 in. x 1/4 in. x 7/8 in. General Purpose 36 Grit Grinding Wheels are ideal for general grinding of ferrous metals, including alloy steel, carbon steel, cast iron, and wrought iron. These general purpose wheels are constructed of high-quality aluminum oxide abrasive grains for increased performance and added durability. The X-LOCK quick change system provides up to 5x faster wheel changes vs. a standard angle grinder mount. Simply pull the release lever on the X-LOCK Angle Grinder and change the wire cup brush no tools needed. These grinding wheels are designed to be used with Makita X-LOCK Angle Grinders (XAG25, XAG26, and GA4570 - sold separately) or any angle grinder with a 7/8 in. arbor.