RAM® 4" Square Post Clamp Mount with Round AMPS Plate - C Size 5.725" two round 2

two round 2

The connection between the swing arm and the base is a bolt pivot point

If you do not allready have the necessary knobs it would be best to purchase The RAM-114DTMU instead

5 inch RAM balls

Compatible with 7/8" - 1" round rails

RAM® 4" Square Post Clamp Mount with Round AMPS Plate - C Size 5.725" two round 2The RAM 101U 247 4 consists of a double socket arm, 2. 5" diameter round base with the universal AMPS hole pattern and 4" clamp base. The clamp base will wrap around a square post with a maximum width of 4" and is tightened by screwing the two plates together with the included nuts and bolts. Rubber ball, socket technology dampens shock and vibration, as well as allows for almost infinite adjustment, perfect viewing angles.