3/4" Rail Stop Two-Piece Clamp-Type, SteelFunction as a mechanical stop on rail mounted shafts Also used as mounting block Can be placed anywhere on a shaft Will not mar shafts Rail Stops function as a positive mechanical end stop or a mounting block on rail mounted shafts. Simple to use, these clamp style devices just slide over the end of both the shaft and support rail or come apart to permit assembly anywhere on the shaft. They can also include drilled and tapped holes for mounting