These Metal Complex hole punch pliers are the perfect tool for metal working projects. These hole punch pliers easily punch through copper, silver and brass, so you can add more components to your jewelry designs. These pliers are made of carbon steel and they feature an ergonomically designed handle for durability and comfort. This tool comes with one extra pin set. Use them with metal blanks to make your designs stand out. These hole punch pliers will punch through metals up to 24 gauge maximum.