Built for consistent performance, our 5/16" Diamond Insert Indexable Bars without coolant holes are ideal for applications using external coolant delivery. Featuring a solid micro grain carbide shank and a heat-treated steel head, these bars offer rigidity and precision for small-diameter boring. Each tool includes one screw and one key for quick insert changes. Inserts are sold separately. Choose from models with or without flats for optimal compatibility with your tooling setup.