Scientific Cutting Tools’ 1/4" Diamond Insert Indexable Bars with coolant holes are designed for tight spaces and high-performance boring. A micro grain carbide shank ensures rigidity, while the heat-treated steel head withstands tough cutting conditions. The integrated coolant holes enhance chip evacuation and temperature control, helping to maintain insert life and surface finish. Each bar comes with one insert screw and one key. Inserts are sold separately. Available with or without flats for machine compatibility.