868/4 IMP DC SB Impaktor square head socket bits, # 3 x 50 mmHigh quality bits for square socket screws. The Impaktor technology offers an above-average service life even under extreme circumstances. Enhanced friction resistance, thanks to the rough diamond-particle coating on the bit tip, prevents any slipping out of the screw head. Particularly suitable for use with customary impact drivers. hexagon, suitable for holders as per DIN ISO 1173-F 6.3.