High Quality Material：The counterbore drill bit is made of high-speed steel, with high hardness, wear-resisting, not easy to break, not easy to rust, and provides excellent cutting ability. The chamfering device is made of high carbon steel, strong and durable. What You Get: A five piece countersink drill set including #5(5/64"), #6(3/32"), #8(7/64"), #10(1/8"), #12(9/64") comes with 5 pieces of replaceable drill bits as a bonus and covers the full range of screw sizes. With One Hex Wrench. These sizes cater to the needs of cabinet and furniture makers, as well as other woodworking enthusiasts. Design: 82-degree chamfer design Counter sink bits built with 1/4" 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 Allen wrench,enables flush screw heads or deeper holes to be covered with matching plugs for professional finish. Adjustable：Best adjustable wood countersink drill bits set ideal for woodworking. The high-quality countersunk hole is fixed on the plane of the handle by the hexagon socket screw to prevent loosening to ensure a firm fit, and can be adjusted to control the depth of the guide hole. Multi-Purpose: Suitable for home or professional woodworking project, used on wood, plastic, PVC, fiberboard, particleboard, plywood, rubber and more. Drill, countersink and counter bore in one step.  In one step, you can drill, countersink and counter bore the perfect sized hole for #5, #6, #8, #10, #12 screws.Ideal for plugs or dowel buttons. Power groove 1/4" hex shank is quick change and impact drill/driver compatibleSpecifications:Material:  High-Speed SteelSize: #5(5/64"), #6(3/32"), #8(7/64"), #10(1/8"), #12(9/64")Color: SilveryQuantity: 11 pcs Packaging details: 5 Pieces Hex Shank Adjustable Countersink1 Pieces #5 Drill Bits1 Pieces #6 Drill Bits1 Pieces #8 Drill Bits1 Pieces #10 Drill Bits1 Pieces #12 Drill Bits1 Pieces Hex WrenchWarm note: 1. Manual measurement, please allow slight errors on size.  2.The colors may exist slight difference due to different screens.