Spring-loaded 'X' design for large phones with rubber caps sports great holding power without hiding your phone; includes optional device tether for peace of mind during rugged use Compatible with any B size RAM Mounts double socket arm; ball and socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum, stainless steel components, and high-strength composite for durability and reliability in the most demanding environments Phone Holder Dimensions: Width Range: 1.75" - 4.5", Depth Range: .875" max Backed by a lifetime warranty