The muvi extra large polebar mount for roll cagesmastshandlebars attach your muvi or muvi hd camera to larger handle bars roll bars boat masts or any diameter tubes ranging from 16mm to 58mm the large polebar mount is ideal for clamping almost anywhere and is completely compatible with the muvi cradle mount that comes with your muvi or muvi hd camera or using with the tripod mount and waterproof case the large polebar mount is perfect for mounting skisurfsnowboard racks roll cages