Worldwide leaders in BLACKNITRIDE/QPQ Technology. Servicing large OEMs as well as the individual. Industries served include: locomotive, aerospace, medical, defense, food and drug, automotive. Blacknitride is trademarked by H&M Metal Processing. If its not H&M its not Blacknitride! Rugged enough for diesel locomotive engines, precise enough for the MARS Rover. American owned family business. www.blacknitride.com www.rubbercityarmory.com #blacknitridetheworld. (less)