Thank you for your interest in my model! This is for 5 sets of "CSP" wheel stops. By design these wheel stops would clamp onto the rail. My model is designed to fit on code 83 and code 100 Atlas and Micro Engineering track. Other manufacturers and rail sizes may also work. I recommend use "Super Glue" to secure model to track.
11/13/18 re-sized to take advantage of "Professional Plastic" thinner walls.