851/1 RZ SB bits, PH 2 x 25 mm, 2 pieces 2x 851/1 RZ bits: PH 2 x 25 mmHigh quality bits for drywall screws. Reduced shaft diameter for low-lying screw connections. Tough viscous for universal use. hexagon, suitable for holders as per DIN ISO 1173-D 6.3.