General description Drill bit set with countersink drill bits in 7 different sizes (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm) along with a hex wrench and a plastic storage box. Each drill bit is marked with numbers for easy recognition, making it convenient to carry and store. Technical specifications Sizes: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm Weight: 2g Compatibility and accessories Includes 1 x hex wrench Compatible with bench drills, hand drills, and traditional electric drills Installation Use the hex wrench to remove the five-sided chamfer or adjust the counter depth and drilling depth for screws of different lengths. Usage Step 1: Turn the hex wrench to set the desired length. Step 2: Drill vertically to the desired depth, ensuring the screw head can lower itself below the surface. Suitable for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc. For best results, use a drill rather than a hand-held electric drill to avoid bending and breaking.