Features:_x000D_ _x000D_ Magic adhesive patch bottom, available pasted flocking sandpaper sheet, wool ball. _x000D_ 100mm and 125mm two backing pad for your choice, meet your different needs. _x000D_ Adopting universal M8 fastening thread, easy to install. _x000D_ Can be used in pneumatic or electric polishing machine, suitable for all kinds of adhesive type sandpaper. _x000D_ Widely used for artificial stone, furniture, wood products, metals, automobiles grinding and polishing, etc. _x000D_ _x000D_ Specification:_x000D_ Material: PU Foam & Hard Plastic_x000D_ Weight: Approx. 100g/3.5oz_x000D_ Thread: M8_x000D_ Diameter: 100mm/4inch; 125mm/5inch (Optional)_x000D_ Operating method: _x000D_ 1. Remove the black rubber thread protective cover. _x000D_ 2. Fixed grinding machine chassis _x000D_ 3. Tighten the grinding pad tightly. _x000D_ 4. Use suede sandpaper to stick to the magic paste. _x000D_ _x000D_ Package List:_x000D_ 1 x Polishing Backing Pad