Brocraft Pontoon Boat Rod Holder/Fishing Rod Holder for Square/Rail Mount Corrosion resistant anodised and polished silver aluminum tube with super tough reinforced engineering grade nylon fittings and 304 stainless steel screws 360 rotation and with fully adjustable rod angle Turns through 12 rest position Rail mount fits the following diameters: 7/8" Rail tube. 1" Rail tube,1-1/4" square tube