Thank you for viewing. This is a TRUSCO Nakayama grommet punch. For 12mm grommets. Stainless steel grommets cannot be used. Please use aluminum or brass grommets. I used it to install about 5 grommets. The included aluminum grommets and hole punch are not included. I purchased it 3 months ago for 2453 yen. The package that the product came in exceeds 3cm in thickness, so I will take it out and wrap it in bubble wrap for shipping. I will include the instruction manual. No returns or exchanges, please.