11-5/8inch IADC 537 Tricone Roller Bit with Tungsten Carbide Insert TCI Tricone Roller Bits Bestlink offers a full line of tricone and bicone bits. Tricone drill bits are available in new and used (re-tip and re-run) steel tooth and tungsten carbide insert, size from 3 3/8”(85.7mm) to 26”(660.4mm) for use in all formations, with any bearing/seal type, and a wide range of additional custom features.