The Railblaza StarPort Mount is a unique, versatile, multi-functional mount that can be used in a variety of applications and allows users to swap out the full range of Railblaza accessories. This mount is crafted out of high grade engineering plastic and incredibly easy to fit; it can be surface or recess mounted on power boats, inflatables, kayaks, ATV's and more. Can be surface or recess mounted, Allows users to fit and swap out full range of Railblaza accessories, Made from high grade engineering plastics, Diameter: 2.4 in., Bolting Dimensions: 1.9 in. o.c., Model Year: 2019, Product ID: 430490, Model Number: RBSTAR-W, GTIN: 0856154004469