Lippert Heavy-Duty Spring-Loaded Pull Pins allow for quick height adjustment and secure hook-ups on a fifth-wheel trailer. Standard landing gear pull pins are a pain. Simply pull the Quick-Release Pull Pin and let the inside leg drop to the ground. When jacks are raise or lowered, the pin will automatically snap itself into place. No more messing with those cumbersome lynch pins. Simply pull and release.• Makes operating landing gear legs less cumbersome• Quicker and easier than standard hair pin• Bright, zinc-plated finish• 3/8" diameter pin fits 7/16" hole• One-time installation• Works with all types of jacks• Bolt-on installation; no welding required• Comes in pack of two Pin automatically snaps into place when jacks are raised or lowered One-time, bolt-on installation with no welding required 3/8"" diameter pin fits 7/16"" hole | Lippert Quick-Release Pull Pins for 5th Wheel Landing Gear, Pair