... M6, M7, M8, M10. M12 2.Length: 500 ~ 4000mm. 3.Cross-sectional area: 15*15mm, 20*20mm, 25*25mm, 30*30mm, ... nitriding, high frequency treatment, black of oxidation, zincing, nickelage. 6.Machine: CNC engine lathe, milling machine, drilling mchine, gear ... : 2-25 Length (mm)Width(mm)Height(mm)500-22001010500-22001515500-22002020500-22002525500-22003030500-22003535500-22004040500-22005050500-22006060500- ...