855/1 TH SB bits, PZ 3 x 25 mm, 2 pieces 2x 855/1 TH bits: PZ 3 x 25 mmPremium bits with torsion zone into which kinetic energy is dissipated during peak loads. This significantly increases the product life. Extra-hard. 1/4", hexagonal, suitable for holding tools as per DIN ISO 1173-D 6.3.