Irwin Blue Groove 6X Auger bit set – 6 piece

The Irwin Blue Groove 6X Auger Bit Set gives you six of the most commonly needed sizes in one go: 16, 18, 20, 22, 25 and 32mm, each bit 165mm in length. If you’ve ever used a standard flat bit and spent half the job clearing swarf and fighting binding, the irwin 6 piece blue groove auger bit set makes an immediate and noticeable difference. Irwin’s own testing puts penetration speed at six times faster than a conventional flat bit. That’s not marketing puff, it’s a genuine result of the Tri-Flute geometry working as intended.

The Tri-Flute design is the main event here. Three flutes rather than the usual two means chips are cleared from the cutting zone much more quickly. Less chip packing means less heat, less friction, and less of that horrible grinding sensation when a bit starts to bind in dense timber. The tapered flute profile helps further by gradually reducing the contact area as the bit goes deeper, so it’s not fighting the wood all the way through.

What Makes the Irwin Blue Groove Auger Bits Cut So Cleanly

Clean entry and exit holes matter on a lot of jobs. Running cable through joists, drilling for pipe runs, making good holes for coach bolts. The cutting spurs on each bit score the grain ahead of the main cutter, which stops the wood fibres tearing out at the edges. The result is a neat, defined hole rather than the ragged mess you sometimes get with cheaper bits pushed too hard.

The full screw tip is worth mentioning too. It threads itself into the timber with each rotation, pulling the bit forward at a consistent rate. You’re guiding rather than forcing, which helps with straight holes and reduces fatigue on longer sessions. All bits in the set are heat treated for durability, which matters when you’re working through hardwoods or engineered timber regularly.

What’s in the Set

Six bits covering 16, 18, 20, 22, 25 and 32mm. That 32mm is particularly useful — large enough for most cable and pipe work without needing a separate spade bit kit alongside. All at 165mm length, which suits most SDS plus and standard chuck cordless drills without any extensions needed for typical through-joist work.