... /2(inch)Type tricone bits,steel tooth bits, PDC bitsApplicable water well,oil field, construction, geothermal, directional boring,and underground foundation ... 131117,124,126,127,136,137211,311216,217, 227TCI(IADC)415,435, 417,437515,525,535,545, 517,527,537, ... toughness and durability suitable for different rock formation)(1) Quick Details Place of Origin:Hebei China (Mainland)Brand Name:kingdreamModel ...