Standard aluminum base with 1 inch diameter B size ball. Base is 2 7/16 inches in diameter. There are 7 holes in the base; 4 holes in a standard AMPS and 3 holes 120 degrees apart For measurements and exact hole patterns click on this link to download a .pdf design file of B202. For use with RAM universal ball and socket mount system. Marine grade aluminum with powder coat finish and rubber balls. Lifetime Warranty.

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