The mast clamps are suitable for mounting an antenna to a pipe/pole, or for attaching a pipe to another pipe to mount an outdoor antenna Using the V-shaped locking brackets with U-bolt, the clamp kit can securely hold the pipes and antenna tight and in place, will not move in the wind. Dimension: Support pipe diameter ranging from 0.98 inch to 2.1 inch/24 mm to 54 mm; Weight: 1740g Material: Quality stainless steel with anti-rust coating Color: As shown Material: Metal Size: 14 x 5.2cm Package Contents: 12 Sets x Antenna Mast Clamp Double V-Shaped Jaw Block with U-Bolts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.