... :116,517,537,617 hole reamer bit size to 50inch Rock Bit- hole reamer bit 1.Type:TCI & Milled tooth size from 12 1/4'' inch ... 60'' or 70inch2.Available size:3.Available IADC code of rock bits Milled tooth:116,117,126,127,136,137,216,217. TCI ... forward cooperating with you.Rita Feng86-18730702717. 40inch TCI Reamer drill bit,steel tooth hole reamer ...