Profile: National Steel Rule Co., Inc. manufactures rotary and flat die rules. Our products include rotary rules, serrated rules, automotive rules, cutting rules, ejection material and blades. Our process includes edge hardening, teflon coating and titanium nitride coating. Our rotary rule 8 tooth is designed to incorporate smooth shaved bevel with precision ground V teeth that easily pierce the board upon initial contact of the rule. Our Dura-Strip is a micro-cellular elastomer designed for automotive and truck applications.