This RAM Mount Medium Length C size double socket locking arm come with two 2.5” round ball bases with Universal AMPS hole pattern for maximum versatility and mounting ability for max viewing angles. KEY FEATURES Drill-down mounting solution; choose either round plate featuring the AMPS hole pattern for attachment to compatible device holders Includes two round ball bases and C size medium length double socket arm; ball and socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum for durability and reliability in the most demanding environments Backed by a lifetime warranty The RAM-101U consists of a medium length C size 1.5" double socket arm and two 2.5" diameter round ball bases that contain the universal AMPS hole pattern. The ball and socket system provides shock and vibration damping, and allows for near-infinite adjustability to achieve an ideal viewing and operating angle of your device.