Based on the process being roller driven and not involving drawing,I'd infer that it's probably similar to wrapping the bar with another layer at some point in

Based on the process being roller driven and not involving drawing,I'd infer that it's probably similar to wrapping the bar with another layer at some point in the process and continuing to roll it. I'd also infer that they don't care about having the ends "capped" with stainless since everyone tends to assume that rebar can be cut off when needed. But YMMV, I'm mostly familiar with much smaller scale fabrication.