4 1 2" Flap Sanding Disc 40 60 80 120 Grit 4.5 Grinding Wheels for 3 Pcs 4 inch Angle Grinder Wood Carving Disc Set, Chainsaw disc 4In Round Polishing Angle Grinding Wheel Wood Sanding Carving Shaping 4 1 2" Flap Sanding Disc 40 60 80 120 Grit 4.5 Grinding Wheels for Grinding Wheels for Angle Grinders 2" 40 120Grit Flap Wheel Sanding Disc Grinding Abrasive Angle Grinder 5. About this item : Grit Material Aluminum Oxide Item Dimensions LxWxH 9. 45 x 8. 86 x 4. 72 inches Compatible Devices Angle Grinder Grit Number 120 Color redDescription: Size: Diameter is 4 1 2, Arbor is 7 8, the flap disc is standard size and suitable for most air and electric grinders. Specification: Type #27, the grinder sanding discs are better for smoothing and blending surfaces. Maximum speed 13300 revolutions per minute (RPM), the wheels perform well. Package contains: 40 60 80 120 grit angle grinder sanding discs, 10 x 40 grit, 5 x 60 grit, 3 x 80 grit, 2 x 120 grit, the combination better matches your requirement.