This is a key case/key holder die. It's a die for a simple key holder. You can easily make one by cutting with this die and attaching a snap button. Why not try making your own original key holder? Ideally, you'd use a press machine, but you can also cut it by tapping if you don't have one. When tapping, it's best to use a rubber hammer or mallet. Place the leather on top of the die and tap with a rubber hammer or wooden mallet. The blade is sharp, so please be careful not to touch it.