Item: FACHLICH Cutting Disc Dia 50mm Different Purpose for Wood Board Metal Quantity: 4pcs Specfication and Application: · High-Speed Steel Cutting Disc: 1)Blade material: HSS(High Speed Steel) 2) Specification: Diameter 50mm;Bore 10mm;Segment Thickness 1mm; 72 Teeth;Mininum RPM:15000; MAX RPM:27000 3)Application: Suitable for cutting soft metal,aluminum board,copper pipe,etc... · Cutting Wood Cutting Disc: 1)Blade material: Diamond Coated 2) Specification: Diameter 50mm;Bore 10mm;Segment Thickness 1mm; Grit:#40/50; MAX RPM:27000; Mininum RPM:6000 3) Application: Suitable for cutting all kinds of wood board, gypsum board,fiberglass,rubber pipe,plastic,etc... NOTE:Suitable for 2" mini cordless angle grinders with 10MM arbor.