Trending Power Rack Plate Holder - How to make an inexpensive set of standard (1) weight plate holders for your power rack that has 2 square tubing and 1 diameter safety pin holes. This cap barbell power rack stand is for the guy who's looking for a basic piece of quality equipment that won't break the bank. Power Rack Plate Holder : Urethane grommet to keep plates from hitting the rack and causing damage.