[Muti-]Adjustable Mast to Mast Mounting Kit offers even more versatility, great for mounting torches,flagpoles,umbrellas,radio/tv antenna and other outdoor decor.[3 Kinds of assembly]The antenna mast clamp is great for mounting round pipe(pole) to another round pipe(pole), square railings to another square railings,or mounting round pipe(pole) to square railings.(The diameter range of round pipes is 1 - 1.8inch, the diameter range of square pipes is 0 - 1.8inch).[V blocks more stable]Heavy duty mast mounting clamp uses blocks with two long (2.2 inch in distance,5.49 inch in length) to give a stronger install for ensuring the patio umbrella not down.[Sturdy construction]Antenna mast to mast clamp kits are made of strong,durable galvanized steel,durable and designed to safely hold your patio umbrella.[Easy to install and move]Outdoor Umbrella Holder Comes with 2pcs small wrenches,no need other tools that attaches to most decks, balusters,railings,or pipe quickly and securely.Colour: as shownMaterial: AlloySize: About 15x7cmPackage Contents:2 * Double Antenna Mast Clamp2 * Small WrenchesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.