Mibro 871570 17-Piece Titanium Extra Life Metal Master Drill Bit Set

What is the best make metal cobalt drill bits? I`m drilling through 4mm angle iron which has just dulled 4 new bits, slow speed with water to cool. I`ve tried Black & Decker which were useless and Bosh titanium which also failed . I`ve quite a few

A: a carbide bit is the best.

Tungsten mine to be revived in challenge to China

An English mine last used when the nation was making armaments to defeat Hitler's forces will be revived to challenge China's grip on tungsten, one of the strategic metals at the heart of a deepening trade dispute with Europe and the United States.

Wolf Minerals Ltd. is developing a tungsten mine in Devon, in southwest England, 70 years after it was last extracted there. The Hemerdon site is the world's fourth-largest deposit and can produce about 3.5 percent of global demand for the metal, used to harden steel in ballistic missiles and in drill bits. China provides about 85 percent of worldwide supplies.

Tungsten was one of the metals cited when President Obama filed a complaint with the World Trade Organization on March 13 against Chinese supply curbs. Tungsten is a critical raw material, according to the European Union, and the British Geological Survey places it at the top of its supply-risk list of materials needed to maintain the United Kingdom's economy and lifestyle.

Source: San Francisco Chronicle

Basic Information About Metal Drill Bits | Phoenix AZ Movers

I learned that there are bits that are designed for boring holes into soft metals, and there are also bits which are capable of drilling into very hard materials. In my experience, I got to study about drill bits for metal and how they are used for various projects. First, there are high speed steel bits, which can be used for general drilling projects. What’s more, they are better than regular bits when it comes to resisting heat, thus allowing you to perform your work smoothly....

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