... chert, firm sandstone, and firm anhydrite and so on.4.According to your request, all sorts of products can ... 4(9 5/8”),250.8(9 7/8”)269.8(10 5/8”),295.3(11 5/8”)311.1(12 ... 1/4”),346.0 (13 5/8”),349.2(13 ... 2”),508(20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124 ... /C at sight, western unionProducts show 8 3/4" IADC 527 Kingdream drill bits for rocks HAS series ...