RAM Mount Zinc Coated U-Bolt Base w/1.5" Ball f/Rails 0.5" - 1" [RAM-231ZU] Ram Mount Store | Seat Mounts The 404 uses an O-ring

The 404 uses an O-ring to keep the line in the sheave during intermittent loading

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RAM Mount Zinc Coated U-Bolt Base w/1.5" Ball f/Rails 0.5" - 1" [RAM-231ZU] Ram Mount Store | Seat Mounts The 404 uses an O-ringRAM Rail Base with Zinc Coated U Bolt & 1. 5" Ball for Rails from 0. 5" to 1" in Diameter The RAM motorcycle handlebar base contains a 1. 5" rubber ball designed to sit at right angles to the mounting rail. The zinc coated u bolt accommodates rails in diameter from 0. 5" to 1" in diameter. Included are black cover caps to be placed over the exposed ends of the u bolt and a composite adapter that can narrow the rail to a minimum width of 0. 5". U Bolt