Sea Dog Hinge Fitting, Top Mount, 90 degree. These Top Mount Hinge Fittings are designed to mount horizontally and attach an eye end in Bimini top applications. Concave Hinges are designed to rail mount on 10 tubing. Angled Hinges are used for mounting items on slanted surfaces like sloped gunwales. 1800 Adjustable Hinge allows universal mounting at almost any angle including vertical mounting. Removable Pin Deck Hinges feature a spring loaded quick release pin for easy top removal. 1/4" pin size. Constructed of corrosion resistant investment cast 316 stainless steel. Installs with two FH fasteners (not included).