... if do business with us19,We are a professional supplier of new and used (rebuilt) drill ... and soft li mestones. Size and IADC available: 3 3/4" to 26" IADC 415,435,445,417, ... 212.7mm(8 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”) 241.3(9 1/2”),244.4 ... .8(10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 5 ... toughness and durability suitable for different rock formation)(1) Quick Details Place of Origin:Hebei China ...