Wera 05073360001 8511 btz premium plus phillips ph1 screwdriver bits pack of 2 wera 05073363001 these 14in hexagon drive bitorsion bits from wera have diamond particles on the tip which bite into the recess of the screw and ensure secure positioning these bits are suitable for use with phillips screws supplied in set of 3 different sizes wera 05073363001 8511 btz premium plus phillips screwdriver bits set of 3