At the most common railing size, the Steel Insert upgrades 1.5" A110 round tubing for heavy, everyday use: a mill-finished steel core slid inside the tube, stiffening it where it takes load — queue railing worked against all day, a guardrail, or a bar footrail. Hidden inside the rail, it fits .050"-wall A110 tubing and arrives in a 12-foot length that matches typical run segments and cuts down for shorter installations. It works as a set with the tubing it reinforces and coordinates with the matching steel post insert for a complete heavy-use railing. Load ratings and cut lengths vary by job — call 1.888.285.8605 for a quote.