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3D3DSilicon nitride milling bit insert.
Milling bit insert, similar to the common tungsten carbide type, except made of silicon nitride instead.
Source: eBay seller dixielandemporium
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 25 March, 2009
Price: $9
Size: 0.5"
Composition: Si3N4