Single chock with flag for flush rail is suitable for use with flush rail systems for U.S. and Canada, The ergonomic high-visibility wheel chock extends the handle to 48" for greater visibility. The worker can stay a safe distance from the car body and wheel when placing or removing the chock. The freight car stop features steel-spurred cast steel chock in this single chock style. The OSHA mandated wheel stop fits all T-rail sizes and wheel diameters from 28" to 42”, flush rail.