General description Silverline Impact Driver Set includes a fully reversible action (clockwise/anti-clockwise) and a 1/2" square drive attachment for use with standard 1/2" sockets. The set features a removable 8mm bit holder and comes with four bits: slotted (1 x 6mm, 1 x 8mm) and Phillips (1 x PH2, 1 x PH4). It is conveniently stored in a handy metal storage case.