OTC's 1/2 inch Impact Driver loosens hard-to-turn screws, bolts, or nuts that normal handtools can't Protective handle design prevents the possibility of hitting your hand with the hammer when striking the impact driver 1/2 inch drive bit holder features a 5/16 inch female hex for Phillips and flat screwdriver bits Includes: 1-3/8 inches long No. 2 Phillips; 3-1/8 inches long No. 2 Phillips; 1-3/8 inches long No. 3 Phillips; 3-1/8 inches long No. 3 Phillips 5/16 inch wide x 1-3/8 inches long slotted; 5/16 inch wide x 3-1/8 inches long slotted; 3/8 inch wide x 1-3/8 inches long slotted; 3/8 inch wide x 3-1/8 inches long slotted