Check the listing for details. RAM MOUNTS LARGE UNIVERSAL DOUBLE SOCKET ARM BALL 1.5" MOUNT BLACK RAM-137 BOAT. Color: BLACK, Condition: New. Listed at 74.95 USD. I am selling a RAM Mounts large universal double socket arm ball 1.5" mount, part # RAM-137 / 3003-7405. This item is new, in original packaging and comes as shown. The RAM Mount is made of powder coated marine grade aluminum and black in color, (4) black plastic plugs, (1) double socket arm mount, (1) 2.5" diameter round base, (1) 1.5" rubber ball and flat 11" x 3" rectangular plate. Universal mounting solution for large and heavy electronic devices, the plate contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more. For more information regarding this item contact a dealer in your area.