10 PC Metal Grinding Wheel Angle Grinder Disc 4 1 2"x1 4"x7 8" 550152 4 1 2" Flap Sanding Disc 40 60 80 120 Grit 4.5 Grinding Wheels for 50 PCS 4 1 2" Grinding Wheels GW41278 Heavy Duty Angle Grinder HQ Parts ALL CARB 10 Pack Wheel Angle Grinder Sanding Disk 125mm Grit40 Premium. 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.