This is a four pack offering of the studs used on John Deere two cylinder tractors. Each stud has a working and installed end. Our studs are NOT undercut at the center. They have a defined rounded crown on the working end. They are made from 4140 steel. This is an exact made reproduction of the original stud. It is those little things we do that give value in 2 ways. One, it will perform like the original. Two, it looks like the original. We are currently using a nickel finish on these studs. We have other kit offerings of these studs with wheel or special hex nuts. Those kits are also supplied with two jam nuts for proper installation.