Save both space and money when you decide you want a spring under your antenna, Instead of buying a stud mount and a spring as individual components, you can buy one part and have it all, The springs are made of stainless steel for many years of service, Two basic models (ring terminal connections and screw-on connection), each available in a medium duty model and in a heavy duty model, are available, Each spring stands about 3 inches (77mm) above the mount surface, The medium duty models are great for 2 ft Firestik and Firestik II antennas as well as 3ft FireFly and Road Pal antennas, The heavy duty models may be used with any antenna up to 5 ft in length, The screw-on connector models (SS-34AM and SS-34AH) utilize Firestik"s premium SO-239 base design, The strength and performance of this design has made it the standard by which all other similar designs are judged by, As expected, the hardware on these models is stainless steel and all insulators are molded in nylon, Made of Stainless Steel, Insulators are Molded Nylon, Includes Both Spring and Stud Mount, Advantage is a Little Lower Profile, Spring is about 3"" Above Mount Surface, Also Available Using Ring Terminals (SS34M Medium Duty) or (SS34H Heavy Duty), Heavy Duty Models Good for Antennas to 5" Tall, 2 Year Warranty, SKU: CBDST0894