Use to obtain the proper depth needed for any application in plumbing or woodworking drop forged high speed steel with titanium coating provides faster smoother and cleaner cuts 14 quick change hex shank can be used in any drill or drill press includes 1 pieces 316 to 12 six step bit 1 pieces 14 to 34 nine step bit 1 pieces 18 to 12 thirteen step bit am tech branded