Check the listing for details. RAM-B-149Z-GOP1U RAM U-Bolt Double Ball Mount with Action Came.... Color: Black, Condition: New. Listed at 55.44 USD. RAM U-Bolt Double Ball Mount with Action Came... RAM-B-149Z-GOP1U Genuine RAM Products! The RAM-B-149Z-GOP1U consists of a zinc coated u-bolt base, standard size double socket arm and 1 INCHES diameter ball with custom GoPro Hero adapter. The mount is designed with a RAM 1 INCHES 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 INCHES to 1.25 INCHES 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 INCHES . The GoPro Hero adapter attaches directly to the underside of the camera, replacing the factory mounting bracket.hardware included Assembly Hardware(1) 1/4 INCHES -20 U-Bolt for .5 INCHES - 1 INCHES Rails(1) 1/4 INCHES -20 U-Bolt for 1 INCHES - 1.25 INCHES Rails(2) 1/4 INCHES -20 Nylock Nuts(2) Rubber Caps(1) U-Bolt Spacerclamp range .5 INCHES - 1.25 INCHES diametersocket to socket length 3 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumHigh strength compositepackaging type Poly BagWeight 0.6 lb hardware included Assembly Hardware(1) 1/4 INCHES -20 U-Bolt for .5 INCHES - 1 INCHES Rails(1) 1/4 INCHES -20 U-Bolt for 1 INCHES - 1.25 INCHES Rails(2) 1/4 INCHES -20 Nylock Nuts(2) Rubber Caps(1) U-Bolt Spacer clamp range .5 INCHES - 1.25 INCHES diameter socket to socket length 3 INCHES ball size B Size (1 INCHES ) weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lb materials Marine-grade aluminumHigh strength composite packaging type Poly Bag Weight 0.6 lb