Specifications: Material: aluminum oxide abrasive Color: reddish brown Back technique: hook and loop Number of holes:8 holes Diameter: 5 inch/ 12.5 cm Maximum speed: 12,000RPM Grits: 40/60 / 80 / 120 / 180 / 240 / 320 grit Quantity: 70 PCS sanding discs ( 10PCS each grit) Features Sanding discs are made from aluminum oxide, designed for high speed sanding and heavy duty removal, delivering fast and long lasting cut. Hook and loop sandpaper backing make easy for installation and removal, simplify your work. Open-coat leads to an even and consistent scratch pattern. Special stearate coating is designed to prevent clogging and loading. Pre-punched with 8 holes for uniform dust extraction.