1) Types: 60 series, 62 series, 63 series, 64 series.

2) Corresponding models range :605-6020 ,623-6220 ,6300-6320 ,6403-6413

3) Material: Gcr15 (Chrome steel) -China, (AISI) 52100-American, (Din) 100Cr6 -Germany, carbon steel, iron.