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