BuyBits 12mm Hexagon Mount & Large Roadvise Cradle for TomTom SatNavs (sku 50650)BuyBits 12mm Hexagon Mount & Large Roadvise Cradle for TomTom SatNavs Holder; Mount fits all SatNavs up to 5" (12cm) wide Compact phone holder design keeps rear smartphone cameras unobstructed Mount; Unique central yoke nut fitting for sports bikes British engineered made from Anodised Aluminium with Composite plastic twist top. Simple twist fitting. Mount base gives you a 17mm (0. 66") ball fitting Note not compatible with steering dampening systems.