420HC Stainless Steel An improved, high-carbon (HC) form of 420 stainless steel that works well with high production tooling. 420HC's strength is optimized in Leatherman multi-tools by heat treatment. We take extraordinary measures so your Leatherman product will give you many years of dependable service. If it doesn't, we will gladly repair or replace it, at our discretion, with one of equal or greater value under our 25-year guarantee for tools and 10-year guarantee for lights. This warranty does not cover abuse, alteration, theft, loss, or unauthorized and/or unreasonable use of your Leatherman product. This warranty does not cover sheaths, accessories, imprinting, color finishes, cleaning, or sharpening.