C k bit clip ph pzd set of 8 ck tools t4522 premium quality chrome vanadium steel precision machined for high performance screwdriving featuring grip tip anti cam out ribs designed to positively engage with the screw head and reduce the risk of slip and cam out excl pz0 ph0 set contained in a convenient bit storage clip bit sizes ph0 1 2 3 pz0 1 2 3ck tools t4522 bit clip ph pzd set of 8