For Sale Antenna Plates Boom to Elements ¼” x 4” x 6”  For: 2.25” Boom and 1-3/8” (35mm) insulated  element. Includes: 0.25 x  4" x 6" plates with hole 2 x Clamping U-Bolt with Saddle Sets, Zinc Plated Steel 5/16 Thread for 2.25” OD and 2 x Polypropylene Clamps Cushions fit for 1-3/8” (35mm) OD element. Polypropylene Clamps are fix and insulate element from the plate comes with   ¼ x 2” Stainless steel bolts and nuts. This Boom Plates keep your Yagi elements stable, insulated and properly secured on the boom.