The MARSHALLTOWN Nylon Handle Putty and Joint Knives are heat-treated, hardened, tempered, and annealed for an even hardness throughout the blade. The Knife has a full tang through the handle, and the smooth black polyethylene handles are resistant to virtually all chemicals and solvents. Our Flex Scraper and Flex Joint Knife have an EMPACT hammering head handle. You can choose your type of Knife, size, and blade material. Our contractor-grade QLT Nylon Handle Knife has a full-length tang that goes through the solvent-resistant nylon handle. It has an EMPACT hammering head.