The RAM Mount GoPro HERO handlebar/rail mount adapter consists of a zinc-coated U-bolt base, short size double socket arm, and 1" rubber "B" ball with custom GoPro HERO adapter. The mount features adjustment points at both ends of the double socket arm; this allows for almost infinite adjustment and perfect viewing angles. Included in this package is hardware that will accommodate rails from 0.50" to 1.25" in diameter. The base includes black cover caps to be placed over the exposed ends of the U-bolt. The included composite rail adapter can narrow the rail to a minimum width of 0.5". Compatible with all HD HERO Original + HD HERO2 professional cameras. Constructed from high strength composite and powder-coated marine-grade aluminum. Adjustment points at both ends of arm High strength composite construction | Mount GoPro HERO Handlebar/Rail Mount Adapter With Short Arm in Black