Stahlwille 54100074 7161 QuickRelease safety lock, size 5

The 7161 QuickRelease Safety Lock, Size 5 prevents removal of the insert tools. It is locked with a safety screw on the head of the torque wrench. After assembly, the insert tool can be inserted but not removed. Interchangeable insert tools can be used again after loosening the safety screw.  A TORX® screwdriver with hole in the tip (No. 4656, T20, product no. 46563020) or a screwdriver bit with hole in the tip (No. 1442, T20, product no. 08160020) can be used to operate the safety screw.