The RAM Tough-Claw is the perfect mounting base for quick and easy tool-less installation and removal on round. square. odd shaped rails and bars. The Tough-Claw can be clamped on rails from 0.625" - 1.5" outer diameter. Ideal for mounting tablets. action cameras. smartphones. rod holders for rod storage and much more in a wide variety of applications. Perfectly suited for mounting on the yoke of an aircraft. handlebars and seat posts of bicycles. kayak rails. roll bars and much more. the RAM Tough-Claw will soon become another essential RAM component in your collection of mounting options. Clamping Range (Rail/Tube Surfaces): 0.625" to 1.5" Clamping Range (Flat Surfaces): 0" to 1.14" Physical Dimensions: Height: 4.25" Width: 1.18"