... with golden performance in well drilling, advanced bearing, heel and shirttail protection Payment terms:T/T, L/C are acceptable.Lead Time for ... ”),244.4mm(9 5/8”),250.8mm(9 7/8”)269.8mm(10 5/8”),295.3mm(11 5/8”)311.1mm(12 ... 24”)660.4mm(26”)Available models: Steel tooth(IADC)111, 121,131117,124,126,127,136,137 ... 527,537,547615,625,635,,617,627,637,737512,522,532,612,622,632,7323 cone rotary rock bit 4 5/8" ...