1/4" x 4" x 6" Universal Aluminum Plates  For 1.25" Mast to 1.25" Boom  or 1.25 to 1.25 element or for GP/ Vertical Antenna project 1.25 mast to 1.25 insulated vertical element. With 4 yellow zinc plated U-bolts and saddles. U-Bolts:This is professional grade series. This series provides high strength steel 5/16” U-bolt with a patented ribbed and notched 13 gauge double edge saddle and hex nuts. This unique clamp offers a lightweight alternative with outstanding strength and seal-ability. Mast Plates keep your Yagi stable and properly secured on the mast. 

from 7/15/21. 
2" is available...