The RAM ROD rail mount adapter for the RAM-114BMU base; this adapter joins to base plates with the screws provided and turns the flat base into a rail base. The adapter is a U shape, so it can wrap around a tube mount and the clamp by joining to the flat base. Compatible with 7/8" - 1" round rails, and 1" square rails.FeaturesRail adapter conversion kit designed to install with the RAMA(R) bulkhead base for mounting to rails .875" to 1" in diameterMade of high-strength composite materialBacked by a lifetime warranty