Wera 05160896001 851/4 R 1/4'' Hex Reduced Tip Phillips Power Drive Bits are high qualioty bits with a reduced shaft diameter for low-lying screw connections, enabling countersinking of screws without any surface damage. Wera 851/4 1/4'' Hex Reduced Tip Phillips ® Power Drive Bits are ductile and tough for hard materials and feature Wera's Connecting Series 4. Wera 851/4 1/4'' Hex Reduced Tip Phillips ® Power Drive Bits are suitable for holders as per DIN ISO 1173-F 6.3.