The Tough Claw Self Leveling Cup Holder Kit consists of the small Tough-Claw base and universal self-leveling drink cup holder. The drink cup holder has two pivot points, allowing for your drink to always stay upright and never spill The cup holder mount rotates 360 degrees and integrated eyelet and hook provide an optional tethering function, securing any small or open container in any harsh environment Compatible with any cups, cans, bottles or mugs ranging from 2.5" to 3.5" diameter Clamping Range (Rail/Tube Surfaces): 0.625" to 1.5" Clamping Range (Flat Surfaces): 0" to 1.14" Manufacture Limited Lifetime Warranty