We have been thinking about these for a long time and I think we have come up with the best way to make them so here goes. This is one of the most popular tubes used in areas you would want removable. One thing we do to make these better is using a larger bolt, that is the weak link so why would you want to rely on a 1/4" bolt? These use a 5/16" bolt. If you overbuild everything like I do you will want the the Double Lock style for additional strength. They're made of 4130 chromoly and are sold individual.