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The RAM-337U includes a 1/4"-20 female thread hex hole connected to a 1.5" rubber ball. Specs Specifications Thread Pitch 1/4″-20

The RAM-B-237U universal camera and camcorder base consists of a B size 1" rubber ball connected to a 1/4"-20 camera

The RAM-B-236U consists of a 1" rubber ball connected to a 3/8"-16 threaded post. Thread length is .5". The RAM-B-236U

The RAM-B-347U base consists of a B size 1" diameter rubber ball connected to a 2" x 1.7" square base.