Articulated Arm, "B" Size Balls, Standard Length Plastic Arm, Plastic Base Plates
Note: I recommend this arm for applications that require 1" (B size) balls because it is light weight and very rugged.  Articulated Arm, Length: 5.4 inches (137 mm), plastic arm, 2 plastic base plates with large 1" (25.4 mm) balls, weight: 4.9 oz (139 g), Diamond shaped mounting plates are 1.25" (31.8 mm) x 2.5" (63.5 mm).  Mounting hardware not included. This kit contains a RAP-B-201U arm and 2 RAP-B-238U base plates.