MAGIDEAL 4xDie Grinder Bits DIY Deburring Engraving Attachment Drilling Rotary Burr Set 5Pcs.Grinder bits are great for woodworkings, engraving, polishing, and drill holes in various materials such as steel, brass, wood, PP, copper, fiberglass, and PVC.The double groove design provides a faster, smoother, and cleaner cutting experience.The rotary burr set is made from premium high carbon steel, ensuring durability and longevity.The three sided handle design prevents slipping when clamping the head of the tool.The high carbon steel bit has undergones heat treatments and high polishing. It features a coating to reduce friction and heat.Rotary Burr Set for Metal Stones Wood Power Tools. Die Grinder Bits Rotary Files Carving Engraving. Polishing Drill Grinding Milling Cutting Tool. DIY Woodworkings Rotary Tool Rasp Bits Deburring. High Carbon Steel Bits Attachment Carpentry Work.