... and 270mm and 310mm, The shank can be designed according to different hammer, for example: DHD Hammers series (DHD340, DHD350, ... R28, R32, R38, T38 etc, lenth can be designed according to customers reqeusts. 6. Intergral Drill steelShank h22x108mm, Tips as 22mm ... , 28mm, 30mm, 32mm, 34mm, Length can be according to customers requests. 7. Coupling with different thread for example R22, R25, R28, R32 ...