These hole punch pliers will punch copper or silver as thick as 18 gauge. Exactly what you need to easily add a hole to that stamping, metal blank or sheet stock. Will create a clean 1.25mm hole without rough edges or burs in sheet metal stock. The pliers have ergonomic handles and are made of thick carbon steel. One (1) replacement pin included. When worn, the pin can easily be changed for a clean cut every time. Measurements: Pliers are 5 1/4" Long. Punch pin is 1.25mm in diameter and will create 1.25mm round holes.