The mast clamps are suitable to mount an antenna on a pipe/ pole, or attach one pipe to another pipe to mount an outdoor antennaUsing the V jam brackets with U-bolt, the clamp kit can securely hold pipes and antenna tight and in place,will not budge in the windDimension: support pipe with diameter raging from 0.98inch to 2.1inch/24mm-54mm; Weight:290gMaterial: quality stainless steel with anti-rust coating finishColour:As shownMaterial:MetalSize:14 x 5.2cmPackage Contents:2 Set x Double Antenna Mast Clamp V Jaw Block with U BoltsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.