Yataro Authentic Japanese Chisel Set (3 Piece) Blade Width: 9mm(~ 3/8"), 12mm(~ 1/2"), 15mm(~ 5/8") Hand-forged laminated Japanese High-Carbon steel, HRC63 hardness Single hollow ground back, less contact area with workpiece Akagashi (Japanese Red Oak) handle with heavy duty steel ring, well balanced Sharpened at factory, imported from Japan