The 5pcs Tungsten Carbide Burr Bits are double cutting head, on electric drive or pneumatic tool (also can be used in machine tool). Features: For electric drive or pneumatic tool (can also be used in machine tool). The electric speed or pneumatic tools usually is 6000-50000 revolutions per minute, suitable for deburring and polishing cast iron, cutting, engraving carving, cast steel, carbon steel, alloy steel, stainless steel and other materials. The machining hardness reaches HRC70, for most work, a set of rotary cutters can replace the small tail circle. And their service life is 10 times longer than normal HSS burrs, 200 times longer than a small tail circle. The double cut style has rows of cutting teeth cut in two intersecting directions for fast material removal and a rougher finish. Tungsten carbide is about twice as rigid as steel, and young's modulus is about 530-700 GPa (77,000 to 102,000 ksi), and it is double the density of steel—almost halfway between lead and gold. It is comparable to corundum (α-Al2O3) in hardness. All feature hardened and steel hardened shanks that provide strength. This prevents bending and reduces vibration for better tool life. Specifications:Material: Tungsten CarbideColor: SilverGroove: Double Solid CuttingCutting Margin Diameter: 6/8/10/12/14mmShank Diameter: 6mm/0.24inTotal Length: 60-65mm/2.36-2.56inPackage Weight: 190g/6.7ozPackage Size: 100*72*19mm/3.94*2.83*0, 75inPacking List:5*bitsMany questions about Dropshipping services are following:1. How many orders can you handle per day? We are a large company in Shenzhen, China, with a large warehouse that can handle large orders every day. We ship countless packages every day. We can guarantee the order you request.2. How fast can you process orders? We will arrange the shipment as soon as possible after you pay for your order. Priority delivery for dropshipping order3. Can you ship an order without any receipts, invoices and promotional offer inside the package? Absolutely! No invoices, receipts, promotional offer if you leave notes on the order (if you want, we can deliver.)4. If you need other products? We can supply most of the products you need as much as possible1If you have any other questions, please feel free to . We are very grateful for your cooperation with you.5. We can support Dropshipping of CSV/Excel files.6. There is no limited inventory to fulfill orders on a daily basis