● Khoom siv: 40Cr● Module: 2M● Kev kho cua sov: Q&T● Hardness: 35HRC● Kev Kawm Tau Zoo: ISO7 / JIS7
● Khoom siv: 42CrMo4● Module: 1M● Kev kho cua sov: QPQ Nitriding● Hardness: 700HV● Kev Ua Siab ntev: ISO7