851/1 TZ SB bits, 3 pieces 3x 851/1 TZ bits: PH 1x25 mm, PH 2x25 mm, PH 3x25 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.