This is a keychain-shaped die. It comes with pre-punched stitching holes for efficient work. Ideally, a press machine is best, but you can also punch it out by hand if you don't have one. When punching by hand, it's better to use a rubber mallet or a maul. Place the leather on top of the die and try hitting it with a rubber mallet or a wooden mallet. The blade is sharp, so please be careful not to touch the blade.