The black S2.RA5E1 End Stops for T5 Type Rail from ARRI come in a pack of 4. These plastic end stops are mounted to the end stop holes at both ends of a T5 type rail to prevent carriages from leaving the rail.
Note! The end stops are to be mounted into the end holes after all carriages have been installed. Moving Rails require end stops in the upper and lower section of the rail.