The metal u-bolt accommodates rails in diameter from 0.5" to 1.25" in diameter. Included are black cover caps to be placed over the exposed ends of the u-bolt and a composite adapter that can narrow the rail to a minimum width of 0.5".

U-Bolt Dimensions:
Accommodates rails from 0.5" to 1.25" in diameter. 

Material: 
Metal

Note: 
Part number reflects product packaged in clear clam shell for store shelf display.