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Hardened to viscous hardness Wera bits for an internal hexagon in a practical set of three pieces. For universal use. Hex-Plus increases the contact area with the screw head. Due to this, the stress concentration in the profile is reduced to a minimum, which virtually eliminates the probability of the screw head breaking. 1/4 "hexagonal shank, suitable for holder to DIN ISO 1173-D 6.3.