Product Description:-Color: Gold, Silver (Optional)-Set of 4 pcs. (3mm-6mm): 3mm, 4mm, 5mm, 6mm, wrench (one piece each) - Set of 7 pieces (3mm-10mm): 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, wrench (one piece each) - - , - Specially designed steel countersink or countersink guide hole. - Use a wrench to adjust the depth of the anti-sleeve. - No need to replace the drill bit with drill bits and countersunk screws. - Just loosen and tighten the mounting screws, you can adjust the drilling length for screws of different lengths.-During use, the wood can be discharged faster,-The counterbore is smoothly drilled at one time, and the nut is perfectly embedded in the surface of the workpiece.-Chamfer diameter (from 3mm to 8mm): 15.8mm-Chamfer diameter (10mm): 18.8mm-Suitable for groove drawing of thin wood, wood, aluminum and plastic. Packaging List:4/7*Set of Countersunk Head Drill Bit with Wrench (Optional)Notes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.