Looking to organize that homegym? Get them weight plates off the floor while using your 3D Printer! I have used these for years now and sold a few hundred. They can take the weight as long as you print them correctly! They are designed to be tapped with either coarse thread 5/8" or M16 so they work on most power rack cross members. Please use a .8mm or 1mm nozzle with 25% or higher triangle infill and 2-3 walls. USE HIPS filament I cant say this enough not only can it take temps and impacts it is one of the few machinable filaments out there so its super easy to tap or even just run a bolt into and let the bolt form the threads. You have 2-3" of internal space for bolts to thread into depending how you long you make these.