These brackets are available in a few different versions. There are 20 and 45 degree brackets, both with two different hole sizes. They are usually only used on sub straps but can be used any where the angles are necessary. We do not recommend using them for laps or shoulders unless your specific situation demands it.
Please be advised, you'll need to purchase the corresponding reinforcement plate if you are bolting these to sheet metal. These are sold as a kit containing four of each bracket and the necessary bolts and washers.