Stainless steel 5/16th studs, nuts and lock washers
Neoprene rubber gasket
The top plate is 1/2 inch thick aluminum and can be painted to match the vehicle.
Ball mount cap plate
Model # 013 $ 45.00
Heavy Duty Antenna Mounts for Mobile Ham Radios $10 Flat rate Shipping with Satisfaction Guaranteed !
And when you are ready to sell that vehicle but have a bunch of holes where your antenna was, then you need a cap. A 4-1/2 inch plate with the same bolt pattern to cover up the mess and help hold the resell value.