The Outdoor Connection Swivel Base Drill Bit Set. Features: One step drilling, Clean cutting, Counter sink fixture, Depth indicator, Use on wood, laminate, or synthetic stocks, For the professional or do-it-yourselfer, Comes with drill bit for 1/2″L and 3/4″L woodscrew and second drill bit for 3/4″L machine screw and can install detachable or non-detachable swivel.