This is a listing for a Gyoku-nen (玉捻) leather creaser. It's almost unused, but there may be some scratches or minor rust due to the long storage period. It will create a line of approximately 1.5mm width on the leather. The thickness of the tool itself is about 3mm. The tip of the groove has been deburred and polished from its hanging state. It can be used immediately, but you may want to customize the shape to your liking.