Scientific Cutting Tools’ 3/8" Right-Hand Triangle Insert Indexable Boring Bars with Coolant Holes are optimized for efficient internal turning in medium-diameter bores. These bars feature a hardened steel head and micro-grain carbide shank for vibration resistance and accuracy. The integrated coolant-through design ensures clean cutting zones by flushing chips away from the insert, reducing heat and wear. Ideal for use with triangle-style inserts, these bars are a versatile solution for high-precision boring tasks on CNC or manual machines alike.