[WE MAKE DIFFERENT]Compare with other styles, We two hand screw nuts to easier and for you to install. [DOUBLE PIPE-MOUNTING]The antenna pipe clamp kit is great for mounting round pipe() to another round pipe(),the diameter range of round pipe is 1 - 1.8inch. [ BLOCKS MORE STABLE]Antenna mast clamp kit uses blocks with U bolts to give a stronger install for ensuring the not slip down. [WIDELY USED]This mast mounting clamp is designed to support WiFi, PCS, Cellular, TV antennas, Ham, flag post, torches, fishing rods, patio umbrella, parasols. It allows you to vary the mounting pipe length. [MATERIAL]Heavy duty mast to mast mounting hardware is made from Metal with anti-rust coating finish. size:14x5.2cm Material:Metal colour:Silver Package Contents: 2 Set x Double Antenna Mast Clamp V Block with U Bolts 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.