Lucky Dog, the one shown on your text are of poor quality. Bought them and thrown them away. They arr dangerous. Don't buy them, for security reasons. You can't find anymore those quality lynch pin any more. My old tractor still have some of them. They do the job. And, because I have to use the hydraulic bar to lowered my attachment , when I am loaded,,because of a down slope, some times these attachments scrape the soil which cause the lynch clip to pry open. The old ones don't open this way. We dhould be able to find the industrial type uses by machinery fabricant, on their new machineries sold, if that exist any more. Good luck.