The Wera 05056341001 840/1 Z Tamper-Proof BO 1/4'' Drive Hex Socket Insert Bit is a tough viscous Wera bit for hexagon socket screws and universal use. Hex-Plus offers a greater contact surface in the head of the screw. The notching effect is therefore reduced to a minimum and damage to the screw head more or less eliminated. Hexagon socket BO screws have a protruding pin in their drive profile.
This prevents any unauthorized loosening since the "normal" hex tools cannot move these screws. 1/4'' hexagon, suitable for holders as per DIN ISO 1173-D 6.3.