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Fine Wire Demon Circle Hook - 4/0 25-Pkg. Unmatched StrengthOur unique three-stage computer controlled tempering process transforms the hook into a fine grained, ultrastrong microstructure. This increases strength up to per cent compared to conventional tempering methods. However, it's not only strength that is important in this process; Mustad has strict quality controls over the brittleness and flexibility of their hooks as well. Mustad's superior technology allows us such control of the final outcome.Surface treatmentMustad hooks feature a wide range of colors and finishes, from black nickel and gold to bronze. The special coatings have been developed to suit the various types of fishing. E.g. Duratin is used for long lining hooks and lacquer for freshwater. Mustad also manufactures stainless-steel hooks in a limited selection. The challenge within this field is to increase the rust resistance of our products even more. Rust ResistanceExperienced fishermen will select their hooks to match the bait or to suit their method of fishing and local conditions. Some hooks are made for specific purposes and are thus available only in one finish, while other patterns come in a variety of coatings. Different coatings have different features and properties. This entails that the rust resistance of the hooks may vary. Mustad runs tests showing how the various coatings compare in this respect. These tests are carried out in accordance with the ASTM B-117 norm, set up by the American Society for Testing and Materials. Tests run in a salt spray chamber show that hooks coated with stainless steel will have 3% surface rust, Duratin 8%, and Double Nickel surface rust after a given number of hours. The results may vary somewhat, depending first of all on the thickness of the coating, but also on fishing conditions, water temperature, type of bait and pH value.Quality control at all stages of production is of major concern to the Mustad company. At the initial stage of the process, every batch of steel wire is physically and chemically tested in Mustad's laboratories. In addition, hooks are tested before and after tempering, after surface treatment and when being packed. Despite the high technological level of our manufacturing process, the most important contributors to quality assurance are still the people involved, both those involved in the manufacturing process and the customers. The feedback Mustad receives from fishermen is invaluable for the development of quality hooks and their quest for the perfect hook. With Mustad hooks you can expect a strong long lasting hook that boasts excellent performance, time after time. FREE Shipping Over $100, No Sales Tax