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-811-1LDP-811Pairs2020Length(mm)80100Height(mm) 5×2, 10×2, 15×2, 20×2, 6×3, 11×3, 16×3, 21×3, 7×4, 12×4, 17×4, 22×4, 8×5, 13×5, 18×5, 23×5, 9×6, 14×6, 19 ...