ROKK Midi Fixed Rail MountInstall small electronic devices directly onto a rail, pushpit or pedestal measuring 1' - 1-1/4' (25.4 to 33.7 mm) in diameter. Compatible with a range of top plates that enables you to mount marine electronics (sold separately.) Features:Corrosion-resistant marine-grade aluminum.Engineered to withstand high shock loading. Technical Specifications:Material - 316 stainless steel and glass-filled nylonDimensions - (L x W) - 1.89' x 2.17' (48 x 55 mm)In the Box:MountMounting hardwareInstruction manual*Sold as an Individual