851/1 TZ SB bits, PH 1 x 25 mm, 2 pieces 2x 851/1 TZ bits: PH 1 x 25 mmPremium bits for Phillips screws. Torque peaks are cushioned by the torsion shape. Premature wear is avoided and the service life of the bit is increased. Tough, for universal use. 1/4", hexagonal, suitable for holding tools as per DIN ISO 1173-D 6.3.