Drill bit set with countersink drill bit in 7 different sizes (3mm/4mm/5mm/6mm/7mm/8mm/10mm) with hex wrench and plastic storage box. With numbers on the drill bits for easy recognition, it meets different needs, convenient to carry and store. User-friendly design: Use the hex wrench to remove the five-sided chamfer or to adjust the counter depth and drilling depth for screws of different lengths. Versatile use: The countersink drill bit set contains 1 x hex wrench and 7 x countersink drill bits in 7 different sizes to meet all requirements. Versatile. Can be used in just three steps: Step 1. Turn the hex wrench to set the desired length. Step 2. If you perform 3 treatments per week, it may take a total of 2 to 4 weeks for you to see visible results. Press and hold the power button for three seconds to turn it on and choose the suction intensity. Step 3. Drill vertically to the desired depth. The depth should be such that the screw head can lower itself below the surface. Perfect for