The RAM-B-149Z-A consists of a zinc coated u-bolt base, short double socket arm and diamond adapter base. The diamond adapter base has a hole pattern that matches the industry standard AMPS hole...
The RAM-B-149Z-A-237U consists of a zinc coated u-bolt base, short double socket arm and 1" diameter rubber ball, connected to a 1/4"-20 camera thread. Designed into the mount is a 1" diameter...