From 3DSolutionsTX's website: This patented device, 3D printed from PLA filament by 3DSolutionsTX, adapts a 3" U-Cup onto a 2" squat rack, filling the gap between the 2" rack upright and the 3" U-Cup L-bracket. This maintains the U-Cup in the proper position and...

U-Cups come standard with HDPE wear pads. However, if you are using a barbell with aggressive knurling, we recommend using these UHMW wear pads. (Keep in mind: we have thoroughly tested the HDPE pads with a Rogue Ohio bar for over 2 years and counting....