[WIDELY USED]This mast mounting clamp is designed to hold most Wifi, PCS, cellular, TV Antennas, CB, Ham, pipe, flag pole, torches, umbrella, parasols, fishing rods. It allows you to vary the mounting pipe length. [3 SETUP ]The antenna pipe clamp kit 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) [ BLOCKS MORE STABLE]Antenna mast clamp kit uses blocks with two long bolts(2.2 inch in distance, 5.5 inch in length) to give a stronger install for ensuring the pole not slip down. [MATERIAL]Heavy duty mast to mast mounting hardware is made from Zine-Plated Steel with anti-rust coating finish. [TWO SMALL WRENCHES INCLUDED]We two small wrenches to easier and faster for you to install. Colour: silver Material: Iron + plated white zinc Package Contents: 3 x Antenna Mast Clamp 2 x wrench Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.