A five piece countersink drill set including #5(5/64 inch), #6(3/32 inch), #8(7/64 inch), #10(1/8 inch), #12(9/64 inch) comes with 5 pieces of replaceable drill bits as a bonus and covers the full range of screw sizes. These sizes cater to the needs of cabinet and furniture makers, as well as other woodworking enthusiasts. The countersink drill bits are perfect for bench drill, hand drill, and a conventional electric drill, perfect for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc. 82-degree chamfer design Counter sink bits built with 1/4 inch Hex Shanks with groove for quick size changes without bit slipping, compatible with most electric drills and tools. An adjustable counter sleeve depth can be easily adjusted with the provided Hex wrench,enables flush screw heads or holes to be covered with matching plugs for professional . The main body is made of carbon steel with high hardness for superb cutting power, high durability and good wear resistance, and the drill bit is made of bearing steel with titanium-plated for more durability and less . 3-in-1 countersink drill bit set ,enable you to drill, countersink and counterbore in .This can make perfect countersink holes for both flush-set and plugged screws, without splitting the wood and enjoying neat projects with drill bit sets. Colour:Black Material:High-carbon steel Package Contents: 1 * Countersink Drill Bit Set 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.