Craftsman 40 Piece Screwdriving Torsion Bits Set (CMAF40SET).

40 Piece Screwdriver Bit Set is engineered with shock-resistant tool steel provides maximum durability. The CNC-machined bit tip ensures a precise fit in each screw recess, helping to reduce wear, stripping and cam-out during wood and metal applications SHOCK-RESISTANT: Constructed with shock-resistant tool steel for maximum durability PRECISE FIT: CNC-machined bit tip ensures precise fit in screw heads reducing opportunity for cam-out