Rich set: you can get 2 sizes of wood drill bits, 2 open-end wrenches and 2 Allen wrenches. Size : 2.8 x 8mm/3.2 x 8mm. Aluminum alloy material: The pre-drill with countersink is made of premium alloy, which has excellent cutting performance, high durability and good wear resistance. Effective chip removal: The helical groove of the cutter with depth stop can quickly clear chips from the hole. Effectively prevents the formation of dirt residue. Removable and adjustable: With the included Allen key, you can remove the screws and adjust the length of the countersunk hole to adjust the drilling length of screws of different lengths and thus improving work efficiency. Wide application: This drill bit with countersink and depth limiter is suitable for hand drills, bench drills and electric drills. It is the ideal companion for woodworking enthusiasts.