Features: ---Medium Tough-Claw Clamp Mount with 1.5" rubber ball: Fits round, square, odd shaped rails and bars from 1" to 1.875" (outer diameter)* ---Quick and easy installation and removal - no tools required ---Rubber pads provide stable, even grip and protect mounting surface ---Tough-Claw dimensions: Height - 5.81"; Width 1.56" ---Constructed of high strength glass filled nylon with corrosion resistant stainless steel hardware(Tough Clamp) ---Works on the yoke of an aircraft, handlebars and seat posts of bicycles, kayak rails, roll bars and more ---Standard length double socket - Overall Length: 5.625" - Socket-To-Socket Length: 4.5" ---A single spring inside the arm opens the end sockets, allowing you to pivot the ball and socket connection ---2.5" round base with 1.