From 115mm, 120mm, to 165mm, 178mm and 270mm and 310mm, The shank can be designed according to different hammer, for example: DHD Hammers series (DHD340, DHD350, DHD360, DHD380 ets. ) , Cop Hammers series (Cop34, Cop44, Cop54 etc.) , HD hammer series, Mach hammer series (MACH30, MACH40, MACH50, MACH60 etc) , Surface can be Flat and convex and others according to different Rock, what's more, we can make them according to customers reqeusts.