DHThammer Low pressure series:J60, J80, J100, J170, J200 High pressure series:HD35, HD45, HD55, HD65, HD85 DTH bits We can provide the DTH bits for DHD340, DHD350, DHD360, DHD380, COP32, COP34, COP44, COP54, COP64, SD5, SD6, SD8, SD12, XL6, QL6, ect. The biggest size we have made at present of the DTH bits is 311mm for Sd 12 DTH hammer.