All RaceQuip Window Net Mount Kits are made from high quality steel then zinc plated for a durable finish. RaceQuip offers four different styles of kits to meet your needs. Kits include all necessary hardware to secure the top and bottom of one window net to a racecar chassis. This kit includes 19.5" spring loaded round bar for the top and a 35" flat bar for the bottom that can be trimmed to size. This shorter top bar is ideal for vehicles with smaller window openings like a Mazda Miata or off-road racing buggies.The top and bottom bars are held in place by the included tabs that are welded to the chassis. There is also an optional top bar pull tab that may be tack welded in place to provide a convenient pull handle to release the net.