Scientific Cutting Tools’ Coolant-Through Triangle Insert Indexable Boring Bars are built for precision, performance, and extended tool life in demanding internal machining applications. Designed to channel coolant directly to the cutting zone, these right-hand bars improve chip evacuation, reduce heat buildup, and enhance surface finish—especially in deep or blind bores. Available in 1/4", 5/16", 3/8", and 1/2" shank sizes, each bar features a rigid micro-grain carbide shank paired with a heat-treated steel head. Compatible with triangle-style inserts, these tools are the go-to solution when thermal control and chip management are critical to the job.