[Easy to install]: The 1/2 inch center hole fits most bench grinders and polishers. These polishing/buffing discs simplify your work and improve your efficiency. [Sewn design] Thanks to the sewn design, these polishing discs are durable and perfect for cutting and polishing bearings. [DIAMETERS] 10 cm surface, 12.7 mm spindle hole. H: 2.5 cm. Material: Cotton. [Use] The polishing discs are ideal for brass, aluminum, bronze, stainless steel, chrome, cast iron and other metals. The rotation speed should be less than 3600 N/min. Our high-quality polishing discs last longer and provide a larger polishing surface. They enable quick and efficient smoothing and polishing of metal and other materials. The round polishing discs reach all corners and hard-to-reach areas. They are carefully ground for optimal sharpness and grip, even on difficult surfaces. Polishing agents to use with: Spiral sewn pads should generally be used with black emery, Tripoli brown or other polishing agents. They can also be used with polishing agents to remove scratches or with polishing agents for an optimal finish. Note: The data is based on manual measurements. Please allow a small error. An error of 1 to 18 cm is possible due to differences in. Color differences may occur due to lighting and screen settings. The actual product received shall prevail.