Tough-Claw™ base and RAM Level Cup™ Self-Leveling Drink Holder. The drink cup holder has two pivot points, allowing for your drink to always stay upright and never spill. Mount rotates 360°. The integrated eyelet and hook provide an optional tethering function, securing any small or open container in any harsh environment. The RAM Tough-Claw™ is the perfect mounting base for quick and easy nstallation and removal on round, square, odd shaped rails and bars and flat surfaces. Easy installation in many applications including motorcycles, kayaks and boats, bicycles, wheelchairs and more. Compatible with any cups, cans, bottles or mugs ranging from 2.5" - 3.5" diameter. Koozie is included.Clamping Range (Rail/Tube Surfaces): 0.625" to 1.5" Clamping Range (Flat Surfaces): 0" to 1.14"