Loosens hard-to-turn screws bolts or nuts. Handle design prevents possibility of hitting hand with hammer when striking impact driver. Bit holder has 1/2" drive and 5/16" hex for Phillips and flat screwdriver bits. Includes eight screwdriver bits. No. 2 Phillips bit 1-3/8" long with 5/16" hex. No. 2 Phillips bit 3-1/8" long with 5/16" hex. No. 3 Phillips bit 1-3/8" long with 5/16" hex. No. 3 Phillips bit 3-1/8" long with 5/16" hex. 5/16" wide x 1-3/8" long with 5/16" hex slotted bit. 5/16" wide x 3-1/8" long with 5/16" hex slotted bit. 3/8" wide x 1-3/8" long with 5/16" hex slotted bit. 3/8" wide x 3-1/8" long with 5/16" hex slotted bit.