The RAM-B-149Z-GOP1 consists of a zinc coated u-bolt base, standard size double socket arm and 1″ diameter ball with custom GoPro® Hero adapter. The mount is designed with a RAM 1″ diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing 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″. The GoPro® Hero adapter attaches directly to the under-side of the camera, replacing the factory mounting bracket. Compatible GoPro® Cameras: HD HERO HD HERO2 HD HERO3 HD HERO 960U-Bolt Dimensions: Accommodates rails from 0.5″ to 1.25″ in diameter. Material: High Strength Composite & Powder Coated Marine Grade AluminumBall Size: 1″ Rubber Ball „B” Size Note: Part number reflects product packaged in clear clam shell for store shelf display. GoPro camera and black thumb screw not included with purchase. Related Links:Custom GoPro® Camera Adapter New Products Page RAM Camera Mounts Page.