Large and strong clamp can clip anywhere you want (0-2.4inch) and can attach to bleachers, benches, tailgates, boats, poles, boats, fences and more. If you are looking for replacement of heavy & huge umbrella holder, this is definitely your smart choice.Quick and easy set-up. Ideal use for umbrellas, flags and fishing poles. You can adjust the hole diameter by tightening the screw. The maximum clampable thickness is 2.4inch. Please do remember to measure the thickness of the clamped object before buying.Designed to offer instant and convenient shade. Perfect for covering bbq grill, sporting events, outside work and other recreation1.5" diameter tube with thumbscrew to securely hold the umbrella and allows you to adjust the height. Umbrella not includedIMPORTANT: Pls check diameter of your umbrella first also your deck or rail to be used before placing order. Only fit pole diameter up to 1.5" and deck railings thickness less than 2.3". Thank you!