Wera 05056605001 851/1 TH 1/4'' Hex Phillips Insert Bits are high qulaity bits for phillips screws. Wera 851/1 TH 1/4'' Hex Phillips ® Insert Bits are designed so that the screws can be applied without any damage to the surface. The torsion design maenas that torque peaks can be abosorbed. This prevents premature wear and enahances the service life of the bit. Wera 851/1 TH 1/4'' Hex Phillips ® Insert Bits are suitable for holders as per DIN ISO 1173-D 6.3.