These are the latches we have on all of our gates in the pens. They work well as long as you keep them from rusting up. Our pens aren't coverd yet and we have to go out the night before we're going to work the cows and hit them up with WD-40. Other then that they work great. You just have to make sure that when you weld them into the gates and the catch plates to the posts that they all line up perfectly before you weld them tight. A little bit off and when you slam the gate they could go all the way through and not catch the gate. I really like them because I can slam the gate in front of a cow to cut her off instead of trying to stop her with a sort stick or something. We got ours at the COOP in Bryan. I believe they were $25 and the catch plates were $5. We tried to build our own catch plate and they don't work, not to say someone better at fabrication couldn't make them but they have a sloped shoulder that facilitates the sliding of the spring loaded latching mechanism and it's worth the money to get those to me.