Wera 05480173001 851/1 TiN 1/4'' Hex Phillips Insert Bits are high quality bits for phillips screws. Wera 851/1 TiN 1/4'' Hex Phillips ® Insert Bits are designed with extra-hard titanium nitride (TiN) coating for withstanding permanent loads such as in industrial applications. Wera 851/1 TiN 1/4'' Hex Phillips ® Insert Bits are suitable for holders as per DIN ISO 1173-D 6.3.