IRWIN Cobalt Step Drill Sets, 1/8 in to 3/4 in Cutting Dia (585-10502CB)($155.88Value)
6X longer life3-Flatted shankSpeedpoint? tipLaser marked sizes Cutter Diameter = 1/8 in [Min], 3/4 in [Max] Cutting Edge Material = M35 Cobalt HSS