About this item [????????? ??????????]: Outer diameter: 4-1/2”, arbor: 7/8", thickness: 1/4”, operating up to 13,300 RPM. [??????? ???????? ????? ?????????]: 4.5” grinding wheels are made of high quality industrial grade aluminum oxide particles that have high hardness, high density and uniform particle structure, making grinding discs high wear-resistant & long life. 30% higher grinding effect than traditional wheels. [?????? & ???????]: Reinforced with three-layer fiberglass mesh, which strengthens the stability of internal structure of the grinding disc, making it difficult to break and making it more safe during use. [???? − ??????????? ????????]: Not only suitable for surfaces but also for grinding at the edges. Outstanding heat dissipation performance keep the discs in a stable condition even when grinding at high speeds. [???? ????? ?? ????????????]: Our grinding wheels are ideal for grinding, cleaning, rust removal, deburring, polishing and more. High speed, High removal rate, Aggressive grinding in steel, stainless steel, aluminum, copper, cast iron and other metals. › See more product details