Set Contents: Round Punches, 7 sizes (20/25/30/35/40/45/50mm) This is a punch set for leathercraft. Material: Iron You can use it to create original wallets, business card holders, smartphone cases, etc., and it is widely used by beginners to advanced users. The product has sharp parts, so please store it out of the reach of small children. When punching holes, place the material on a sturdy piece of wood or similar, lay a cutting mat on top, and strike with a shockless hammer, etc.