Material -GCr15 ; hardness ≤3mm HRC53-60; > 3mm HRC58-65.4.

Marsch product include: 1, M metric thread gauge 2, UN American standard thread gauge 3, BS British standard thread gauge 4, SM sewing thread gauge 5, G straight pipe thread gauge 6, NPSM American standard thread gauge 7, RB new standard tapered pipe thread gauge 8, PT Japanese standard tapered pipe thread gauge 9, RP German standard tapered pipe thread gauge 10, plain plug and ring gauges  11, MT Morse taper gauge  12,7: 24 taper gauge  13, pin-type plug (male) Regulation