PRx 3x3 Pro Spotter Arms (Pair)Sold in Pairs. Keep yourself safe when you lift. Partner or not, spotter arms are designed to take a beating and catch your bar if you fail a rep. The top of the spotter arms are lined with UHMW wear strips to protect the knurling of your bar. Looking to add to your workout? Use these spotters for rack pulls, bent over rows, and standing overhead press too! When youre ready to work out, unfold your PRO Rack and attach the spotter arms to the front.