Wolff High Leverage Shears have a professionally honed cutting edge and made in the USA from 420HC stainless steel with approximately Rockwell hardness rating of 58. All hardware is stainless steel and it comes with a nylon lock nut. The Model 504-M has a larger handle for a more comfortable fit. They easily cut strapping, leather, and PVC. They are excellent shears for florists, shoe repair, marine, upholstery, carpet, and more. They cut the toughest materials, are chemical safe, and rust resistant. The Model 504 comes with a 9” overall length and 3 1/8” cut length. The scissors come with a modified cutting edge designed for hard to cut fibers.