As you would expect, Firestik takes the Dome Mount to the next level! Instead of a multi-part insert that can develop high resistance, and not be accessible for repair, our insert is now one solid piece, It is impossible for it to have any developed internal resistance or worse, opens, We also molded this piece using glass reinforced nylon for durability and longevity, Both models are made to mount in a standard 1/2"" (13mm) hole so you can use them on all common mounts (mirror mounts, flat mounts, stake hole mounts, etc, ) or by itself as a stand alone mount, Each model includes a rubber seal as well as an underside support washer, These mounts have a 2"" (51mm) diameter base, and when installed with the rubber seal in place, stand a little over 2"" (52mm) tall, The major difference in the two models is the method of connecting the coax cable, Requires the Coax Cable to be Terminated, Made to Fit a Standard 1/2"" Hole, Designed with a One Piece Molded Insert using Glass Reinforced Nylon, SKU: CBDST0739