... 537, 617, 637,737,827 TypeTri-cone bits, Steel tooth bits, PDC bits Applicablewater well, oil field, construction ... 6-17 1/2(inch)Type tricone bits,steel tooth bits, PDC bitsApplicable water well,oil field ... 20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124,126,127 ... Packaging & Delivery Packaging Detail:carton, wooden box, steel box or as your requirementsDelivery Detail:within 7 ...