If you're looking for a solid, secure way to attach your Cell Phone or Smart Phone, Camera, Action Camera to your tree stand, boat, bumper, rollcage, or just about anywhere. You've tried the cheap mounts and found out that they simply don't stay steady or attached? So have we! This mount comes complete with a SOLID steel Crab Clamp that can attach to any square, round, or oval tube up to 2 1/4" diameter. (tool less installation) The Crab Clamp base attaches to the 11" 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 arm AND both ball sockets on the ends. So you just loosen, adjust to the desired position, and lock it in place with a simple half turn of the knob. The phone holder attaches via standard SAE 1/4" thread.