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The Irwin Blue Groove 4X flat bit have a patented groove point and cutting edge. The cutting edges cut the timber 4 times faster, without scraping. The parabolic scoop optimises control and removal of wood chips.
 
These flat bits have an increased relief angle from 12° to 17° . The large shank is 152mm in length and 10% larger in diameter for added durability.
 
The Irwin IRW10502813 Blue Groove 4x flat bit has the following specific dimension:
Diameter: 20mm