Enhanced Design: Our 5-flute design with 5 blades offers smoother drilling and cleaner cuts, reducing chatter and providing chamfers on a variety of materials including metal, wood, and plastic. When drilling metal, cutting oil will help a lot. Versatile Sizes & Angles: This comprehensive set includes sizes 1/4inch, 3/8inch, 1/2inch, 5/8inch, and 3/4inch with a universal 82-degree angle, perfect for cutting countersink holes at an 82-degree angle, and screws, bolts, or other fasteners can be properly seated or hidden, resulting in a smooth . 1/4inch Quick Change Hex Shank: Equipped with a 1/4inch quick-change hex shank, our drill bits lock securely into impact drivers and quick-change chucks, enhancing grip and minimizing slip. Portable & Well Organized: 5-piece countersink drill bits are with size identification and well oiled for anti-rust purpose Colour:Photo Color Material:steel Package Contents: 5x Countersink Drill Bit 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.