... , firm sandstone, and firm anhydrite and so on.4.According to your request, all sorts of products can ... 2”),222.2mm8 3/4”) 241.3(9 1/2”),244.4(9 5/8”),250.8(9 7/8”)269.8 ... (10 5/8”),295.3(11 5/8”)311.1(12 1/4 ... 2”),508(20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117, ... /C at sight, western unionProducts show 8 3/4" IADC 527 Kingdream drill bits for rocks HAS ...