1/4", Stainless steel screwdriver bits, in plastic box. Very handy, can be used anywhere, no protruding tips, no risk of injury, fits in any pocket. Magazine with bits (6.3 = 1⁄4″) and with adapter for drills and cordless screwdrivers or for inserting into the plastic magazine holder as a screwdriver handle, Length: 147.5 mm Drive / Socket 1/4 " Application Manual operation , Machine operation Type Item Design Bit , Hexagon socket , Torx , Phillips , Pozidriv , Sets Main color silver Secondary color black Profile size PH1 , PH2 , PZ1 , PZ2 , TX20 , TX25 Wrench size 4 mm , 5 mm