Step drill bit set: Design various sizes, 3/16-1/2 inches (about 1.9 cm), 1/8-1/2 inches (about 0.9 cm), 1/4-3/4 inches (about 0.6 cm) ), they are made of high-speed steel and plated with titanium. These step drills are resistant to high temperature, corrosion and rust, and are practical and durable.Countersunk bit set: made of high-quality carbon steel, the surface of the countersunk bit is plated with titanium to prevent rust; it is durable and can be used for a long time; they are suitable for quick replacement, suitable for most with 1/4 inch (about 0.6 cm) hex shank For power tools, the blade is hardened and polished to improve sharpness. All drill bits have a 90 angle at this point. Allow peak and precise counter sink.Automatic center punching: The automatic center punching is so effective that you can mark the workpiece with pits to prevent the screw and drill bit from shaking, helping you to complete the work accurately and quickly, saving time and energy.Wide range of uses: very suitable for drilling, reamer, chamfering, screw heads, etc. ; Suitable for chamfering various materials, such as wood, plywood, aluminum, iron, copper, fiberboard, particle board, plastic, PVC board, etc.Colour: goldMaterial: steelPackage Contents:3 * Step drill bits6 * 5 Flute countersink drill bits1 * Automatic center punchOnly 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 allowed error is +/- 1-3cm.