Made from high grade alloy steel, hardness HRC58-62. Finely ground in pairs. Specially process to guarantee the high accuracy steadily, no distortion for long time.Accuracy means parallelism and pair height tolerance.In wooden stand. Model No.LDP-813Pairs24Length(mm)150Height(mm) 11×8, 16×8, 21×8, 26×8, 31×8, 36×8, 13×10, 18×10, 23×10, 28×10, 33×10, 38×10, 15×12, 20×12, 25×12, 30×12, 35×12, 40×12 ...