Descriptions:* Made of nylon bristles, sides of bristles act as flexible files to all kinds of holes, grooves and corners.* Great tool for removing rust and painting from flat surfaces, lightly sanding wood and preparing metal or wood for painting.* Suitable for woodworking, mahogany furniture, three plywood surface finishing, the purpose of complex furniture wood grain processing, concave and convex surface grinding operations. Specifications:Model: 240 GritsMaterial: NylonShank Diameter: 6mm (1/4 inch)Shank Length: 44mm (1.73 inch)Grinding Diameter: 82mm(3.23 inch)Thread Size: M8 x 20mm (0.79 inch) Package Content: 3 x Abrasive Nylon Wheel Brush