We offer discount for large quantity. Welcome to us!8pcs HSS Reaming Drill Bit Parts Set 90 Degree Countersink Bits Titanium Chamfer Cutters Drill Milling BitsIdeal for making countersunk holes and countersunk holes for plugs. The countersinks are carbon steel, the surface is titanium coated, strong and , not easy to rust, long service life. This kit is suitable for home improvement and daily use, allowing you to drill easily and effectively, without burrs. Universal size compatible with all kinds of drills, drill machines, including vertical drill and other common cutter. Used in hardness 25 under the part, such as carbon steel, car body, insulation board, pvc board, woodFor 90° chamfer hole or taper hole, chamfer edge edge and processing angle angles can be finished the treatment of the cone for one time. Applicable to small cutting process. Neat edges, smooth, no broken edge, small chamfer resistance, high precision in the hole, more big chip flute, fast to eliminate chipsThree blades medium for labor intensity, each blade force smaller, high efficiency and more Specifications:Handle: round handleColor: gold+silverMaterial: high-speed steelSurface treatment: titanium coatedCuts:Head diameter*shank diameter*length6.3MM: 6.3MM*5MM*37MM8.3MM: 8.3MM*6MM*40MM10.4mm: 10.4mm*39MM*6MM12.4mm: 12.4mm*10MM*46MM16.5mm: 16.5mm*47mm*10MM20.5mm: 20.5mm*47mm*10MMBomping Content:8pcs*three drilling chamferOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm. About UsWe provide good product with best price, we support wholesale order/