Widely Used: Suitable for different kinds of polishing according to your needs, it is mainly used for polishing all kinds of metal surfaces and jewelry, mold in small deburring area of rust and surface polishing. Size: rods are 3mm, polishing wheels are 2.5cm in diameter, abrasive wheel is 25mm. Convenient and practical : suitable for small area deburring and surface polishing to achieve smooth and even finish and conformance to irregular surfaces, small size, high efficiency, low cost. Contents: 40 pieces in total, 10 pieces of each grit, green, gray, red, black. 3mm mandrel polishing wheels compatible with most rotary tools, polishers, hand drills, etc.< /p> It is mainly used for removing burrs, dust removal, removing oxide layer and coating, which can improve the quality of metal stone and other materials . It is an important part of mechanical processing technology. It is a necessary, economical and effective method. Features: Material: scouring pad. Color: black + green + red + grey. Shaft diameter: 3 mm. Brush diameter: 25 mm. Total length: 50 mm. Thickness of sanding head: 10 mm. Weight: 157g. Package Contents: 40 polishing wheels. Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some difference color, depending on the physical item received.