CBI Heavy Metal Boring Bars are manufactured in sintered alloys of 95% tungsten with a nickel-copper-iron matrix. These alloys are very similar to tungsten-carbides but the chemical composition was developed differently to reduce embrittlement. The high density (twice as heavy as steel) and tensile strength (110 kpsi) of this alloy makes the ideal combination for chatter free tools. Heavy metal boring bars greatly enhance boring application by absorbing vibration and drastically reduce chatter, enabling to machine deeper bores with greater precision and finish.