We are the manufacturer of most complete models of DTH hammer and bits in China. It includes:
1) 3.5" hammer, shank : DHD3.5
2) 4" hammer, IR DHD340A / SD4 / COP44 / QL40 shank
3) 5" hammer, IR DHD350R / SD5 / COP54 shank
4) 6" hammer, IR DHD360R / SD6 / COP64 / QL60 shank
5) 8" hammer, IR DHD380 / SD8 / COP84 /QL80 shank
6)10" & 12" hammer, SD10/SD12 shank, Numa120, Numa125
7) above: 15", 18" DTH hammer and bits

If you are interested in them, don't hesitate contact me.

Yong Zhe