Check the listing for details. Hanson Marking System Numbers 3/8" A7. Condition: Used. Listed at 36.00 USD. The Hanson Marking System Numbers 3/8" are precision punches designed for use in a variety of industrial and business applications. With a 3/8" size, these punches are ideal for making accurate and consistent marks on materials. The Hanson Marking System is known for its quality and durability, making these punches a reliable tool for professionals and DIY enthusiasts alike.