Brownells Surface Hardening Compound 1 lb

Brownells Surface Hardening Compound is a case-hardening medium used in gunsmithing to harden the surface of steel parts. Applied by packing around metal components and heating, it diffuses carbon into the surface layer to create a hard, wear-resistant case while maintaining a tough core. Sold in a 1-pound container, it is suitable for small components, receivers, and other steel firearm parts requiring surface hardness improvement.