This toolkit includes a 1/4" high speed steel drill bit for the pilot hole and a 17/32" high speed steel drill bit for the finish hole. Each hole accommodates the 5/16" rivet nuts included with all EZ Claw mounting brackets. The drill bits are equipped with a non-marring HDPE stop sleeve to ensure accurate depth of the drill hole, and a center punch is provided for pinpoint accuracy. The kit also features a carrying case and manual rivet nut tool. Extra rivet nuts are included as well.