The mast is suitable for mounting the antenna on a pipe/pole, or attaching one pipe to another pipe to mount an outdoor antennaWith U-bolt V jamming brackets, the clamp kit can hold the pipes and antenna firmly and in place safely, it will not move in the windDimension: support tube with diameter raging from 0.98 inch to 2.1 inch/24mm-54mm; Weight: 290g Material: High quality stainless steel with anti-rust finishColor: As shownMaterial: MetalSize: 14x5.2cmPackage Contents:2 Set x Double Antenna Mast Clamp V Jaw Block with Screws Only the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm