Rep Steel J-Cups for 1000 Series Power Racks - Barbell Hook Storage for PR-1100 and PR-1000 Weight Cages 1 pair of UHMW-lined J-cups. Our power rack comes with a pair already, but if you want an extra pair, this is it! Protects the knurl on your bar from metal-on-metal contact.Metal-on-metal contact wears away bar knurl over time, our UHMW-lined J-cups saves your knurl. Fits 2x2" uprights, with 1" diameter pins. Heavy-duty design, 1,000 lb weight limit Black powder coating.