The Hi-Q Antenna Insulating Wafer Kit for installing your antenna to mount plates providing antenna isolation from ground. There are two sizes depending on your antenna mast diameter. The 2" wafers are for the smaller Coils 5" and below and use a 3/8 X 24 TPI mounting bolt. The 2.5" wafers are for Hi-Q Antennas that have the 2.5" large mast and have a 1/2" x 20 TPI mounting Bolt. All Wafers have a 3/4" x 1/8" raised area around the center bolt hole which is designed to center the bolt on a mounting plate with a drilled 3/4" hole.
Each kit includes: 2 insulating Wafers, 1 Bolt, 1 Large Flat Washer and 1 Split Lock Washer.