... IADC 447-837 API Kingdream Brand New Rolling bearing steel tooth rock rock bits 1.Introduction about us: ... bits, single cone bits, steel tooth bits, insert tooth bits, roller bits, drill bits, drilling tools etc. we have been ... quantities of products are in stock to meet your special need. 3.Sizes and types of drill bits ... 20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124,126,127, ...