Isshindo Yoshichika Stamp Carving Knife - Professional Use Aogami (Blue Paper Steel) Long Blade - 18mm 1 square = 1 centimeter A blade suitable for woodworking, a knife for fine work and maneuverability. For folk crafts, wood carving, Buddhist statues, Buddhist altars, carving, art carvings, etc. 18, 21 mm available. Please comment. 15mm left-handed blade available. Used by national treasure carvers.