Irwin 4X and 6X Blue Groove Mixed Bit Sets - 8 Piece Set

6X Blue Groove Wood Bits - 3 pieces (22, 25 and 32 mm).

Full screw tip - for ease of use and pull through.
Cutting spurs - for clean holes with minimal 'break out'.
'Tri-flute' design - for faster chip ejection.
Tapered flute - for less binding and ease-of-use.
Full length heat treatment - for extra durability.

4X Blue Groove Flat Bits - 5 pieces (12, 16, 18, 20 and 22 mm).

Increased relief angle - from 12-¦ to 17-¦.
Parabolic scoop - optimizes control and removal of wood chips.
Patented groove point and cutting edge - cutting edges 'cut' (do not scrape) the wood 4X faster.
10% larger shank - added durability.