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Because of the way they are used and the high speeds at which they are run, router bits often become very hot. Tungsten carbide maintains its hardness at high temperatures and holds an edge far longer than high-carbon or high-speed steels.
 
Typical cheap bits are ground on the equivalent of key-cutting machines, evident in the rough bevel, uneven cut, and bit chatter. Lee Valley professional/industrial grade bits have tungsten-carbide inserts ground on CNC (Computer Numeric Control) machines with 600x diamond wheels. Most are chip-limitation style for safety and balance. The bodies have a non-stick green coating for easy resin removal.
 
All Lee Valley router bits include a friction-fit bit holder made of an advanced polymer, which can be mounted horizontally or upright.
 
In recent years, inexpensive bits from China have appeared in growing numbers.
Our bits are made in Taiwan by a reputable manufacturer with strict quality control.
 
To optimize wear resistance and edge strength, the carbide ranges from ISO grade K10 to K20, depending on the profile of the bit (straight bits are close to K10; others are K20).
 
Unless stated otherwise, bits are double flute for a smooth cut. Ball-bearing pilot guides are used on all appropriate bits to prevent marring and burning of work and to control width of cut in freehand use.
 
We offer extra bearings in various diameters to give alternative profiles to some bits.
 

 
 


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