Mild steel metal tubing caps are perfect for your welding projects. Each dome is 2.5 inches in diameter. Domes are roughly 0.5 inches tall or deep. These are cut from 14 gauge steel which is about as thick as a nickel. Domes are pressed by hand with handmade tooling. Our custom made tooling allows us to make each dome nearly identical to the next one. We hope we can supply you with a great starter for your welding projects. Watch for more supply products to come in our shop! All of our products are 100% made in USA and made to last!