Base with 9/16" Ball
Marine grade Aluminum, 9/16" diameter rubber ball, Diamond shaped mounting plate is 1.25" x 2.5". The center of the ball is 11/16" above the base of the plate. Weight: 0.7 oz (20 g) Mounting hardware not included. PDF Drawing
Warning!
Most people find that the "A" sized components work fine for holding a small phone in an aircraft or automobile. However, I have received several complaints about the rubber balls detaching from the bases. I therefore recommend the larger "B" sized arms for most soaring applications. In fact, one customer temporarily lost control of his sailplane when his PDA cradle fell off the RAM A arm and jammed the control stick. I have never heard of a RAM "B" size arm component failing.
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Tags: A size, Aluminum, Rubber Ball, Diamond Base