Scientific Cutting Tools’ 5/16" Diamond Insert Indexable Bars with coolant holes are engineered for precision and longevity. Designed with a micro grain carbide shank and a heat-treated steel head, these bars deliver rigidity and reliability in demanding boring operations. Coolant-through holes help reduce heat and flush chips from the cut zone, extending tool life and improving surface finish. Each bar includes one insert screw and one Torx key for easy setup. Inserts are sold separately. Choose from models with or without flats for optimal compatibility with your tooling setup.