The pneumatic clamp/release unit SLE operates with a freewheel pull-bar which ensures that it is uncoupled at the spindle operation. The clamp/release unit SLE can be operated with Ortlieb intensifier KV. The compact unit offers simple and easy integration. The position control via inductive position measuring system offers safe clamping and releasing. Coolant rotary feed through can be integrated and it is also possible to make different installation modifications.