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Tungsten carbide inserts.
An example of the element Tungsten

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Tungsten carbide inserts.
The Boeing aircraft company operates a wonderful surplus store in Kent, Washington (near Seattle). These are solid tungsten carbide cutting inserts: They each fit a particular milling bit, where they are clamped or screwed into place. When they wear out, they can be replaced, allowing the body of the bit to be used indefinitely.
Source: Boeing Surplus Store
Contributor: Theodore Gray
Acquired: 30 September, 2007
Text Updated: 30 September, 2007
Price: $2
Size: 0.75"
Purity: <50%
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