Extra hard assorted screwdriver bit sets bosch 2607002564 13 piece screwdriver bit set phillips pozidriv ph1x2 ph2x3 ph3 pz1x2 pz2x3 pz3 13 number of pieces set contents quick change universal holder improved torsion zone handles supplied in set of 13 bosch 2607002564 extra hard phillips pozi screwdriver bit set 121