... high projection.3)This cutting structure design, combined with maximum cone offset, results in high bit ... durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert ... for insert bit.Gauge Structure Multiple gauge protection with gauge trimmers on the heel of cone, ... 1/2",4 5/8",4 3/4",6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",15",15 1/2",17 1/2 ...