Features:1. Ideal for wooden boards, fiberboard, particle board, plywood, plastic, alumiumn board, circuit board, DIY, home and general building/engineering use and many more.2. The drilling length can be adjusted for screws of different lengths simply by loosening and tightening the set screw.3. Great for sinking 90 degree holes into wood and soft metals countersunk screws and fastening, for sharp and precise countersinking, the cutting edge is hardened and ground for sharp thickness.4.1/4" hex countersink shank are good for high-speed drill bit, do not slip in drill chucks.5. You can easily make deep countersinks by setting the countersink depth stop to allow the countersink to drill deeper into the work surface. Specification: Material: High Carbon Steel Five-Edge Hex Shank: 6mm (1/4''), 8mm (5/16''), 9mm (3/8''), 12mm (1/2''), 16mm (5/8''), 19mm (3/4'') Reaming Drill Bit: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm Wood Slicer: 5/8" (15.8mm), 1/2" (12.7mm), 3/8" (9.5mm), 1/4" (6.3mm) Center Punch: 132*12mmPackage Included:6 x Five-Edge Hex Shank1 x Center Punch7 x Reaming Bit Drill Bit1 x Wrench4 x Standard Plug Cutters4 x Four Tooth Cutters