It can be used for metal grinding and repairing. From grinding to polishing, the wide range of grinding needs to be to meet the requirements of cutting, surface processing and tool life. Grinding wheels are widely used in precision grinding processes, burrs cleaning, and edge grinding. This product uses high-strength material, sintered by ceramic bond, and the center is shaped with a metal handle. The product line can meet the requirements of hard material processing. Shank Diameter: 3mm Out Diameter: 4mm, 5mm, 6mm, 8mm, 10mm (mixed batch) Shape: Taper & Cylindrical Feature: Hard-wearing, Strong power grinding Application: Used on high-speed electric grinder and pneumatic tools. Mainly used for DIY grinding and polishing wood, metal and mold etc. For marble, glass, handicrafts, synthetic hard materials, hardware, and special metals, the polishing effect is particularly good. Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Material: Chrome corundum colour: pink Package Contents: 100 x grinding head (mixed batch) Only the above package content, other products are not included. Note: Light reflection 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.