Features: ---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 ---Dimensions: Height - 5.81"; Width 1.56" ---Fits most RAM 1.5" socket arms ---Constructed of high strength glass filled nylon with corrosion resistant stainless steel hardware ---Works on the yoke of an aircraft, handlebars and seat posts of bicycles, kayak rails, roll bars and more ---Genuine RAM Mount: Part # RAP-404U ---Manufacturer's lifetime warranty ---Made in the USA * Clamping range for flat surfaces is 0" - 1.6".