Perfect Size: The grinding wheels are perfectly compatible with all 4-1/2 inch (115mm) angle grinders and 7/8 inch (22.2mm) arbors. Thickness: 0.25 inch (6.35 mm), which is also suitable for cutting. Max RPM: 13300 Durable and Efficient: The metal grinding wheel is made of high-performance aluminum oxide grain, which is durable and has excellent material removal ability Premium Material: Each one is high-quality and durable, bonded with corundum and white corundum particles and reinforced by a double layer of fiberglass mesh, these grinder blades for metal perform longer than other wheels that may break or wear prematurely Widely Use: This grinding wheel is designed for all metal, fiberglass, iron, plastic, steel and stainless steel parts, including rebar, steel pipe, structural and galvanized steel, sheet metal, structural tubing and other ferrous metals Safety: This grinding wheel is made of aluminum oxide particles. It is safer than other wheels that may shatter or wear out prematurely. Please mount correctly and wear all applicable safety equipment when using, and do not use over speed