Engineered for extended-length boring applications from 4:1 up to 6:1 dia-to-length ratio, heavy-metal boring bars handle finishing and medium-machining ID turning, grooving, and threading tasks. They have heavy metal construction with brazed steel heads and help reduce failure possibilities while in use. Bars are available in variety of sizes, including 8, 10, 12, 16, and 20 mm and 3/8, 1/2, 5/8, 3/4, and 1 in.