The RAM-B-347U base consists of a 1" diameter rubber ball connected at right angles to a 2" x 1.7" square base.

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The base has four pre-drilled holes at each corner, making the universal 1.5 x 1.188 (hole spacing) AMPS hole pattern.

Compatible with the - which comes with four supplied bolts to fasten down to this plate.

Blue LocTite recommended.