Products Providing the best tool steel is only part of the International Mold Steel advantage. DC53™ DCMX™ DH2F DH-31-EX™ DHA™ World NAK55 NAK80 PX5 S-Star Superplast® Toolox® 33 Toolox® 44 Cold Work Steels Our steels offer uniform hardness through the core and microstructures that result in tougher and longer wearing steels. Hot Work Die Steels Our hot work steels provide the best balance of toughness and strength to deliver dies that are tough to the core. Plastic & Rubber Steels Our industry leading steels feature uniform hardness and clean microstructures for machining, stability in use, and maintenance resulting in superior plastic and rubber mold.