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High quality bits with Torsion zone – where kinetic energy is diverted from peak loads. This greatly extends the product service life. Extra-hard; 1/4" hexagon, suitable for holders as per DIN ISO 1173-F 6.3.Features and Benefits• For Phillips screws• Particularly hard for semi-hard materials• Torsion design against premature wear• 1/4" hexagon drive (Wera connecting series 4)• Suitable for AEG, ARO, Atlas-Copco, Biax, Black & Decker, Bosch, Buckeye Tools etc.Contents851/4 TH bits, PH 3 x 50 mm