Material and Art Making: 45# carbon drop forged steel, with heat treat and black on the surface.
Spcification: 10-12mm, 11-13mm, 12-14mm, 13-15mm, 13-17mm, 14-17mm, 16-18mm, 17-19mm, 17-21mm, 19-21mm, 19-22mm, 19-24mm, 22-24mm, 24-27mm, 24-30mm, 27-30mm, 30-32mm, 32-36mm, 36-41mm
Surface Treatment: Black coated, chrome plated, nickel plated