This DeWalt 17 piece impact socket set is a tough, high quality professional set designed for use with 1/2" drive impact wrenches Ideal for tightening bolts in steel framework and tightening hex drive nuts/bolts in fixings. All sockets are supplied in a sturdy re -useable storage container for convenient transportation. Features and Benefits: Impact rated sockets for use with 1/2" drive impact wrenches Manufactured to the highest standards to ensure durability Can be used for driving coach screws into wood Black oxide finish with laser marking Supplied in a heavy duty high-density polyethylene storage case Includes Diameters mm 6,8,10,11,12,13,14,16,17,18,19,20,21,22,24,27mm 1/4" to 1/2" Adaptor mm.