DTH bits are our main products. After many years research, we have rich experience in development and manufacturing high quality products, which adopted high-quality raw materials, advanced technology and passed through strictly inspection. 3" DTH hammer bits (85mm - 105mm), shanks : DHD 3.5, COP 34, COP 32, Mission 30, BR 3, Mach 303; 4" DTH hammer bits (105mm- 130mm), shanks: DHD 340/COP 44, COP 42, QL 40, SD 4, Mission 40, XL 4, Mach 44; 5" DTH hammer bits (130mm- 152mm), shanks: DHD 350/COP 54, COP 52, QL 50, SD 5, Mission 50, XL 5; 6" DTH hammer bits (152mm- 171mm), shanks: DHD 360/ COP 64, COP 62, QL 60, SD 6, Mission 60, XL 6; 8" DTH hammer bits (200mm- 305mm), shanks: DHD380, QL 80, SD 8, Mission 80, COP 84.