It features 1.5"" rubber ball size and powder coated marine grade aluminum constuction. With a twist of the arm knob, you can move the RAM-101-G2U mount to your optimum viewing position. Garmin RAM-101-G2U Features: RAM Mount Double Socket Arm, 1.5"" Rubber Ball Size, Made From High Strength Material, Powder Coated Marine Grade Aluminum, Compatible With: Fishfinder: 120, 140, 250, 250C, 340C, 400C, 80, 90, GPSMAP: 172, 172c, 178 Sounder, 178c Sounder, 292, 298 Sounder, 420, 420s, 421, 421s, 430, 430s, 431, 431s, 440, 440s, 441, 441s, 450, 450s, 520, 520s, 521, 521s, 525, 525s, 526, 526s, 530, 530s, 531, 531s, 535, 535s, 536, 536s, 540, 540s, 541, 541s, 545, 545s, 546, 546s, 550, 550s, 555, 555s"
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