Scientific Cutting Tools’ 5/16" Right-Hand Triangle Insert Indexable Boring Bars deliver reliable performance for internal turning without the complexity of through-coolant. Built with a durable carbide shank and a heat-treated steel head, these bars offer excellent rigidity and repeatability. Designed for use with standard triangle-shaped inserts, this tool is an ideal choice for shops that prioritize simplicity and stability in small-bore machining. A great all-purpose option for short-run jobs, manual setups, or machines without high-pressure coolant.