851/4 BTZ bits
Wera 851/4 BTZ BiTorsion Extra-Tough Long Service Life bit, for Phillips screws.
Often bits break as they can't handle the peak stress put upon them, the tip breaks and damage is also often caused to the screw head. Wera designed the BiTorsion system to prevent premature wear and significantly increase the service life of the bit. The system uses a two-stage cushioning process which allows smaller impacts to be absorbed by the bit holder, and high impacts to be cushioned in the torsion zone of the bit. BiTorsion extra-tough bits are ductile and tough, suitable for use with hard materials.
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