Package Includes: The countersink drill bit set includes 5 sizes, each size comes with a hex wrench. Multiple Sizes: 2.8 x 8mm, 3 x 8mm, 3.2 x 8mm, 3.5 x 8mm, 4 x 8mm, suitable for drilling holes in wood of various sizes. Alloy Countersink: High precision, high hardness, fast cutting speed, providing good performance for drilling. L-shaped Wrench: The hex wrench can be used to adjust the depth of the sub-sleeve and the drilling depth of screws of different lengths. Applicable Materials: Used for chamfering flexible materials such as wood boards, plywood, fiberboard and particleboard.