In the LOCKED-series type L, the chamber between the spring plates is filled with compressed air. The spring plates (shown in yellow) deform and the horizontal dimension shortens. This causes the clamp shoes to move away from the rail, releasing the clamps and permitting free movement. When venting, the spring plates recoil to their original position so that the clamp shoe is pressed and clamped against the rail. When clamping piston rods in LOCKED-series type P, clamping is achieved by pneumatic pressure on spring steel diaphragms. When the air pressure is released, these spring plates clamp a slotted sleeve against the shaft or piston rod. When pressure is applied, the clamping sleeve expands in a radial direction and the clamping action is released. For rotation clamping in the LOCKED-series type R, clamping is actuated by ring-shaped spring steel diaphragms, which clamp directly on the shaft or axis when the air pressure is released.