[Multipurpose] Adjustable mast to mast mounting kit offers added versatility, ideal for mounting torches, flagpoles, umbrellas, radio/TV antennas, and other outdoor accessories. [3 Types of Assembly] The antenna mast clamp is suitable for mounting round pipe (pole) to another round pipe (pole), square railing to square railing, or round pipe (pole) to square railing. (Round pipe diameter range: 1 - 1.8 inches; square pipe diameter range: 0 - 1.8 inches). [V-Jaw Design for Enhanced Stability] Heavy-duty mast mounting clamp features jaw blocks with two long bolts (2.2 inches center distance, 5.49 inches length) for a secure installation, helping prevent patio umbrellas from slipping. [Sturdy Construction] Antenna mast to mast clamp kits are constructed from durable galvanized steel, designed to safely support your patio umbrella. [Easy to Install and Relocate] Outdoor sun umbrella holder includes 2 small wrenches—no additional tools required. Attaches quickly and securely to most decks, balusters, railings, or pipes. Color: As shown Material: Alloy Size: Approximately 15 x 7 cm Package Contents: 2 x Double Antenna Mast Clamp 2 x Small Wrenches Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.