Features: ---Round 2.5" diameter base plate with 1" ball - Plate has pre-drilled holes, including the universal AMPS hole pattern ---Stanard size(medium) double socket arm - Overall length: 3.69" ---Square 2" x 1.7" base with four pre-drilled holes, one at each corner, making the universal 1.5 x 1.188 (hole spacing) AMPS hole pattern ---Fits a variety of device cradles ---RAM ball and socket system with easy adjustment points for your optimum viewing position ---Overall mount height if fully extended: 5" ---Constructed of powder coated marine grade aluminum ---Genuine RAM Mount: Part # RAM-B-139U ---Manufacturer's lifetime warranty ---Made in the USA.