1/4" x 11" X 12" Aluminum Plates for 2" mast to 2" boom. With 8 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.