The C.K Blue Steel Impact Screwdriver Bit - PZ Set of 10 T4510 is perfect for heavy-duty applications. The V8 steel alloy construction ensures extreme toughness, while the torsion control technology prevents damage from high torque applications. The blue steel finish provides a vastly extended lifespan, and the colour coded design makes it easy to find the right bit size. The set comes complete with a bit storage clip and bit holder, making it easy to keep your screws organised and close at hand. The sizes included in the set are as follows : PZ1 x2, PZ2 x 5, PZ3 x1 & PH2 x1.