Newest Tricone Rock bits 1)used for oil filed, water well ... seal 4)used to drill low compressive stren tricone rock bit1)used for oil filed, water well3)metal seal ... compacts. size: from 4-5/8"(117.5mm)---17-1/2"(444.5mm)type:417,437,517,537, ... /8",9 7/8",12 1/4",14 3/4",17 1/2", etc. IADC Code:4-- Series, 5-- ... Series, 6-- Series,etc. Newest IADC 437 Tricone Rock bits/dtill bit/PDC bit/TCI triconebit