851/1 BDC SB bits, PH 2 x 25 mm, 2 pieces 2x 851/1 BDC bits: PH 2 x 25 mmHigh quality bits for Phillips screws with tiny diamond particles on the bit tip. This ensures a secure fit of the bit in the screw, reduces the contact pressure required and lowers the risk of slipping. Comes with Torsion zone where kinetic energy is diverted from peak loads. This