RAM 2.5" Round Base with 3/8"-16 Female Threaded Hol & 1.5" Ball - RAM-202CNSU

The RAM-202CNSU consists of a 1.5" diameter rubber ball connected to a flat 2.5" diameter base with 3/8"-16 female threaded hole. This mount has pre-drilled holes, including the universal AMPS hole pattern. Specs & Features Material: Powder Coated Marine Grade Aluminum Ball Size: 1.5" Rubber Ball Size Note: Part number reflects product packaged in clear clam shell for store shelf display. Weight:0.23 lbs.  Compatible With Compatible Arms and Mounts RAM Medium Length Double Socket Arm for C Size 1.5" Balls - RAM-201U RAM Short Double Socket Arm for C Size 1.5" Balls - RAM-201U-B RAM Long Length Double Socket Arm for C Size 1.5" Balls - RAM-201U-D RAM Double Socket Arm with RAM® Pin-Lock™ Security Knob and Key Knob for C Size 1.5" Balls - RAM-201-SU RAM Composite Double Socket Swivel Arm for C Size 1.5" Balls - RAP-200-2U  RAM Mount - RAM Composite Double Socket Swivel Arm for C Size 1.5" Balls - RAP-200-12U RAM Composite Medium Length Double Socket Arm for C Size 1.5" Balls - RAP