Solid HSS one piece construction of comp [ Solid HSS one piece construction of composition ( HSS- M35 ), threading hand taps Size M20 x 2. 5P, Flute length 50 mm, Total length 130 mm, tolerance H- 8, Hardness should be RC 64/ 65, each set consists of 3 pieces first, second and finish to tap in loco wheel axle. Make Addison, Miranda, JK, IT, Extol or Dormer. ]