Package includes: 5 drill bits, 5 hex wrenches and 5 screws. Drill bits of different sizes can meet your different needs. High quality: Made of high-quality alloy steel, with higher precision, higher hardness, faster cutting speed and strong force than ordinary drill bits. Removable and adjustable: Use the included hex wrench to remove the screw and adjust the length of the countersunk hole to adjust the drilling length of screws of different lengths. Practical function: The spiral flute with a center drill will quickly discharge the chips from the hole. It can effectively prevent the accumulation of debris retention and improve drilling efficiency. Wide application: Suitable for drilling holes in wood material, ideal punch drill for solid board, particle board, plywood, MDF. Also suitable for plastic, soft metal, fiberboard, etc. Note: The data are all measured manually, please allow 1-3cm error, due to differences in light and display, there may be some color differences, please