Made of Polished steel * Rail Dimensions: 1" x 3/4" Stud Dimensions: 5/16"*2" * Clearance: 1 1/2" ,Overall Dimensions: 13" W x 4" H (above deck) * Mounts: (2) 5/16" threaded bolts with 12" apart center on center * Easy to mount anywhere there is access to a thru-bolt, Made with 2" X 5/16" studs, and mounts Flush with hardware included.