RAM Mount 2.5" Round Base w/0.31-18 Female Thread & 1.5" Ball - AMPs Pattern [RAM-202U-MT1] Brand_Polk Audio The diamond adapter base has

The diamond adapter base has a hole pattern that matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles

and provides simple

Diameter (mm): 102

5' Bolt On

RAM Mount 2.5" Round Base w/0.31-18 Female Thread & 1.5" Ball - AMPs Pattern [RAM-202U-MT1] Brand_Polk Audio The diamond adapter base hasRAM 2. 5" Round Base (AMPs Hole Pattern) with 0. 31 18 female thread & 1. 5" Ball The RAM 202U MT1 consists of a 1. 5" diameter rubber ball connected to a flat 2. 5" diameter base with 0. 31 18 female thread. This mount has pre drilled holes, including the universal AMPS hole pattern. Material: Powder Coated Marine Grade Aluminum Ball Size: 1. 5" Rubber Ball Size Note: The "U" in the part number reflects product packaged in poly bag.