... 1/2",9 5/8",9 7/8",12 1/4",17 1/2", etc. IADC Code ... protection with gauge trimmers on the heel of cone, tungsten carbide inserts and hardfacing on the shirttail ... 1/2",9 5/8",9 7/8",12 1/4",14 3/4",17 1/2", ... gauge inserts on the gauge surface of the cone, tungsten carbide inserts and hardfacing on the ... 9 5/8",9 7/8",10 5/8",12 1/4", etc. IADC Code:5-- Series, ... 1/2",9 5/8",9 7/8",12 1/4",15",15 1/2",17 1/ ...