[WIDELY USED] This mast mounting clamp is designed to hold most Wi-Fi, PCS, cellular, TV antennas, CB, Ham, pipe, flag poles, torches, umbrellas, parasols, and fishing rods. It allows you to adjust the mounting pipe length. [3 ASSEMBLE SETUP OPTIONS] The antenna pipe clamp kit is suitable for mounting round pipe (pole) to another round pipe (pole), square railings to square railings, or round pipe (pole) to square railings. (The diameter range of round pipes is 1 - 1.8 inch, the diameter range of square pipes is 0 - 1.8 inch) [JAW BLOCKS MORE STABLE] The antenna mast clamp kit uses jaw blocks with two long bolts (2.2 inches in distance, 5.5 inches in length) for a secure installation to help prevent the pole from slipping. [MATERIAL] Heavy-duty mast-to-mast mounting hardware is made from zinc-plated steel with an anti-rust coating finish. [TWO SMALL WRENCHES INCLUDED] Two small wrenches are included for easier and faster installation. Color: Silver Material: Iron with white zinc plating Package Contents: 3 x Antenna Mast Clamp 2 x Wrench Note: Light and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.