... :3 1/2''--60'' hole reamer bit 2.Type:Milled tooth & TCI 3.IADC:116,517,537,617 hole reamer bit ... 50inch Rock Bit- hole reamer bit 1.Type:TCI & Milled tooth size from 12 1/4'' inch to 60'' or 70inch2 ... .Available size:3.Available IADC code of rock bits Milled tooth:116,117,126,127,136,137,216,217. TCI:417 ...