These DeWalt screwdriver bits are designed for use with impact drivers for optimal results. These strong and durable screwdriver bits are supplied in a handy, plastic, tic tac, flip-top box · · · 25 screwdriver bits per set · · High quality hardened steel · · Ideal for applications in wood, metal, plastic and dry wall · · Extra hard Phillips 2 bits x 25 mm for extra long life and toughness · · System Set · · Flexible storage options – Small Bulk Storage case fits inside the small, medium and large cases as well as the TSTAK compatible accessory caddy.