This Countersink Drill Bit Set includes 7 pieces: 2.8mmx8mm, 3.2mmx8mm, two 3.5mmx10mm, two 4.0mmx10mm tapered pilot drills, plus an L-type hex wrench. The matched sizes cover common screw diameters for clean pilot holes, countersinks, and counterbores. Made with M2 HSS pilot drills and -carbide alloy cutting edges, this Countersink Drill Bit Set uses a helical chip design to clear debris fast and cut smoothly. It's tuned for 82 imperial screws, delivering chatter-free countersinks. Dial in drilling and countersinking depth on the Countersink Drill Bit Set using the hex screws and depth-control stops; swap or set pilots quickly with the included wrench. Precise, repeatable results for cabinetry, furniture, decking, and trim work. Versatile Countersink Drill Bit Set for natural and engineered wood, MDF, particle board, plywood, plus aluminum and other non-ferrous metals and decorative panels. Ideal for woodworking, home improvement, and pro carpentry across many projects. For crisp edges, run the Countersink Drill Bit Set at slow speed around 200 RPM and let the bit do the work; avoid excessive force. If you ever run into any issues, just reach out-our team is ready to provide troubleshooting help, replacements, or other solutions to make sure you're completely satisfied. This 7-piece Countersink Drill Bit Set is built with M2 HSS pilot drills and cutting edges for clean, precise countersinks. The adjustable depth stop ensures accurate drilling, while the helical chip design clears debris quickly. Perfect for wood, MDF, plywood, particle board, aluminum, and other non-ferrous metals, this set is ideal for woodworking, cabinetry, and home improvement. Comes with multiple sizes and a hex wrench for quick adjustments, making it a reliable tool for both DIYers and professionals. Color: As Shown Material: High Speed Steel Package Contents: 7*pcs woodworking tools 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.