Application :
As ratchet attachment for drive components No. 645500 and 645605, but also as ratchet attachment to torque wrenches with 3/4 inch square drive.

Version :
Drive components / connecting parts to DIN 3122 / 3123; external square drive to DIN 3120 B 20 with sprung pin; internal square drive to DIN 3120 D 20 with hole and release knob. Very sturdy design, reversible for right-hand and left-hand use.