612305 5Pcs Abrasive Metal Cutting and Grinding Disc Set 3Pcs Abrasive metal cutting disc: 75mm(3")X0.8mm(1/32")X10mm(3/8") Max speed: 20100Rpm 2Pcs abrasive metal grinding disc:76mm(3")X4.0mm(4/25")X10mm(3/8") Max speed: 25000Rpm