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Many rails do not have stops. Stops to prevent the car from sliding off and losing all of its tiny ball bearings. So, depending upon what is at either end of your linear rail, you may need to have a stop to prevent the car from coming off. Enter these rail stops. You bolt the rail down and also bolt one of these at either end of the rail which needs a stop. The stop bolts to the extrusion using a long 3, 4, or 5mm bolt and extrusion-frame nut. (Well, for 5mm you may need to ream the hole out; I don't recall.)