1.5 inch 'C' size RAM Balls. Commonly used by SLH for deck mounting rod holders, fish finders and camera booms onto fishing kayaks. The RAM-347U rectangular base mount consists of a 1.5" diameter rubber ball connected at right angles to a 2" x 1.7" rectangle base. The base has four pre-drilled holes at each corner. 

• Rectangular 2 x 1.7" base aluminium, fitting hardware not included, (pictured above), part# RAM-347U
• Rectangular 2.5 x 2" composite base, fitting hardware included, (pictured below), part# 72023046
• Also see: Stainless mounting hardware