There is no impact on use, but please be aware that there is some peeling as shown in the last image. This is a simple keyholder-shaped die with pre-punched stitching holes. Finished product size: 55 x 40mm With pre-punched stitching holes, you can work efficiently. It is better to use a rubber mallet when striking. Place the leather on top of the die and strike it with a rubber mallet or wooden mallet. The blade is sharp, so please be careful not to touch it.