C-Style Clamp can be used for mounting truck caps or covers with fiberglass or aluminum rails. Useful for many other applications and industries. (Transportation, Manufacturing, etc) 

Deluxe design for mounting aluminum rail truck caps or covers.

A= 0 to 1-3/4" Clamping Range

B= 1-1/2" Major Reach

C= 3/4" Minor Reach

SEE CHART FOR DETAILS.