Scientific Cutting Tools’ 1/2" Diamond Insert Indexable Bars with coolant holes are built for larger-diameter boring operations that demand rigidity, chip control, and extended tool life. Each bar features a micro grain carbide shank for reduced deflection and a heat-treated steel head for strength under load. Coolant holes direct flow to the cutting zone, improving chip evacuation and temperature control. Every bar comes with one insert screw and one key for easy setup. Inserts are sold separately. Available with or without flats to accommodate various fixturing needs.