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 Specifications:Mounting Style: RailCut/Uncut: CutBox Dimensions: 2″H x 3″W x 7″L WT: 0.4 lbsUPC: 819505020334Quick Guide (pdf)