... chert, firm sandstone, and firm anhydrite and so on.4.According to your request, all sorts of products can be ... 1/2”),508(20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124, ... 126,127,136,137211,311216,217, 227TCI(IADC)415,435, 417,437515,525,535,545 ... after orderPayment Terms:T/T, L/C at sight, western unionProducts show 8 3/4" IADC 527 Kingdream drill bits ...