RAM® 3" Square Post Clamp Mount with Round AMPS Plate - Medium Arm GPSMAP 7" Series The RAM-101-B-225B2U consists of a

The RAM-101-B-225B2U consists of a C size short length double socket arm

including Marine GPS

The RAM-101U-247-3 consists of a 6 inch double socket arm

Each pivoting point allows a complete 360 degree rotation

5" diameter round base

RAM® 3" Square Post Clamp Mount with Round AMPS Plate - Medium Arm GPSMAP 7" Series The RAM-101-B-225B2U consists of aThe RAM 101U 247 3 consists of a 6 inch double socket arm, round 2. 5" diameter round base with the universal AMPS hole pattern and 3" clamp base. The clamp base will wrap around a maximum width of 3" 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.