C k bit clip slotted set of 8 ck tools t4521 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 set contained in a convenient bit storage clip bit sizes slotted 3 4 4 5 5 5 5 6 7 8 9mm ck tools t4521 bit clip slotted set of 8