4 Inch Round Wool Felt Disc Wheel Pad, for 100 Angle Grinder, Buffing Polishing Buffer Bore Dia-White & Green Features High quality material: These pads are made of soft elastic wool material, which are safety, sturdy and wear-resistant with longer service time.Dimensions: The outside diameter of them are 4" (100mm), inside diameter are 16mm and the thickness are 8mmPerfect for 100mm angle grinder and suitable for 12000 RPM angle grinder.WIDE APPLICATION: This buffing wheel disc pads are widely applicable in various surface buffing and cleaning, such as metal derusting, glass and ceramic polishing, marble, automotive and wood floor polishing, etc.