SM-18-ASeaview Mast Mounts are designed to have the radar or satdome as close as possible to the mast. Ultra heavy duty mounting feet and rivets are used to secure the Mast Mount to the mast.AdjustableDesigned with fore and aft adjustable rails so that you can have the radar as close as possible to the mast.Incredible StrengthThe solid under body construction not only greatly improves strength but also hides radar cables. On certain models.AccessoriesPre-drilled under body allows for flood lights or horns to be mounted on certain models.Compatible Units:Intellian - i4 & i4PKVH - M5, FB250(18), TV5 Raymarine - 45STV Sea Tel/Cobham - ST14, FX150 (16.5) VDO - Ocean Line 337