Hornet Outdoors Universal Phone BracketThe Hornet U 4064 Smart Phone Mount comes complete with a SOLID Crab Clamp that can attach to any square, round, or oval tube up to 1 1 4" diameter. (tool less installation) The Crab Clamp base attaches to the Hornet Quick Adjust arm. Unlike the friction adjustments used on most camera mounts, this unique arm has a unique mechanical design where a simple twist of the elbow knob loosens the entire arms AND both ball sockets on the ends so you just