Open-end wrench attachments allow for side access to tighten screws and sockets on pipe connections, hydraulic lines, and threaded rods. The automatic short release provides a clearly audible and tactile click signal when the preset torque is reached. It features high release accuracy according to DIN/ISO 6789, with a tolerance of +/- 3%. The attachment tools have a notch (9 x 12 mm) for locking with a spring pin.