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 4, 5 & 7mm. PH1, 2 & 3. PZ1, 2 & 3. TX15 & 20.