Wera 8511 bdc premium plus phillips screwdriver bits wera 05073335001 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 this set includes 2 bits suitable for use with phillips screws wera 05073335001 8511 bdc premium plus phillips ph2 screwdriver bits set of 2