Professional carpenters, cabinet makers, and DIYer enthusiasts will appreciate its wear resistant construction for furniture assembly, cabinetry, and precisions drilling tasks O High speed steel countersink drill bit set with 4 flute design ensures fast, precise holes and includes a built in hole reamer for enhanced efficiency in woodworking and DIYer projects Universally 6.35mm Hexagonal shank fits most drills, while removable stop collars and steel bit enable adjustable drilling depths and multiple materials compatibility create clean holes in workshops or home renovation projects using the tool removal systems and quick to change bit conversion feature, Manufacturer: YIGZYCN