Ck t4560 blue steel impact screwdriver pozidriv bits ck tools t4560 pz2d15 these blue steel impact screwdriver bits from ck are manufactured from specially formulated v8 steel alloy for extreme toughness and are suitable for use with pozidriv screws ck tools t4560 pz2d15 blue steel impact screwdriver bit 25mm pz2 box of 15