SIZE - 1/8 inch (3mm) . 7/8 inch diameter, 1/2 inch thickness ABRASIVE BUFFING POLISHING WHEEL SET-- Brown: 80 Grit,Green:150 Grit,Red:240 Grit,Black:300 Grit, 4 Colors, 10 pieces for each color, totally 40 pieces Mainly suitable for removing burrs, rust, dust and removing the oxide layer. Widely used in -electronic equipment, jewelry and other industries.which can improve quality of metal stone material, and it is an important part of the machining process. It is an efficient polishing tool of metal and non-metallic materials in small area of rust deburring and surface polishing. Color: brown+green+red+black Material: Nylon Brush diameter: 25 mm/ 1 inch Length: 46 mm/ 1.8 inch Quantity: 40 pieces Package Contents: 10 x Red Abrasive Buffing Wheels 10 x Brown Abrasive Buffing Wheels 10 x Black Abrasive Buffing Wheels 10 x Green Abrasive Buffing Wheels Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.