Pneumatic Clamping Element which is compatible with the HIWIN HGR series rails and carriages. The brake is spring loaded. Which means pneumatics need to be added/present to release the brake. This is normally done with a 5/2 Valve. This MKS type is made to hold a carriage in place, it is not suitable for active braking. In case you need this type, consult us email@example.com for more information. There are models which are suitable for active braking.