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IRWIN

Irwin Tools IRWIN SPEEDBOR Drill Bit Set for Wood, 4-Inch, 6-Piece (1877239)

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Availability: In Stock.
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Arrives Friday, Oct 9
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Features

  • Three cutting spurs for faster, cleaner holes, less breakout and extended drilling life
  • Full screw-point tip allows bit to self-feed for ease of drilling
  • Shorter overall length for drilling in tight spaces. Ideal for holes up to 2" deep
  • 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills

Description

The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills. From the Manufacturer The IRWIN SPEEDBOR Max Speed wood drilling bit is the FASTEST SPEEDBOR EVER. The Speed Tip features a full screw-point that allows bit to self-feed, as well as three (3) cutting spurs for faster, cleaner holes, less breakout, and extended drilling life. The tapered tri-flute design allows for faster chip ejection and less binding. Its grooved hex shank prevents slipping and fits all standard 1/4" quick-change chucks, including impact drills.

Material: Blend


Cutting Diameter: 10.2 centimeters


Finish Type: Brushed


Shank Type: Hex


Cutting Angle String: 135 degrees


Brand Name: IRWIN


Model: 1877239


UPC: 042526916762


Set Name: SPEEDBOR MAX 4IN OAL 6PC CLAM SET


Unit Count: 1 Count


Global Trade Identification Number: 62


Manufacturer: IRWIN


Part Number: 1877239


Number of Pieces: 6


Included Components: (6) Speedbor Max Speed Bits sizes 1/2" ,5/8", 3/4", 7/8", 1" and 1-1/8"


Item Type Name: SPEEDBOR MAX 4IN OAL 6PC CLAM SET


Item Weight: 1.6 ounces


Cutting Diameter: 10.2 centimeters


Item Dimensions: 1.22 x 6.1 x 9.25 inches


Minimum Bore Diameter: 4 inches


Material Type: Blend


Finish Types: Brushed


Shank Type: Hex


Surface Recommendation: Wood


Cutting Angle String: 135 degrees


Tool Flute Type: Spiral


Point Style: Screw Point


Number of Flutes: 3


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 9

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Top Amazon Reviews

    • Good bits for drilling in Douglas Fir.
Size: One Size
Good value for someone who is going to use these for drilling rough holes in softwood. I drilled about 100 holes in 3 inch Douglas fir, and the bits are going strong. Be careful because they are aggressive and will put significant amounts of torque on the user if using a high-powered drill. The length of the bits in this particular set is shorter than another similar Irwin Speedbor bit I purchased at the hardware store, but still did the job just as well. In fact some may discover that the shorter length will allow you to get into tighter places. Nothing for me to complain about this set. ... show more
Reviewed in the United States on January 12, 2022 by Rob Avi*****
    • Worked Perfect, much better than a Paddle Bit!
Size: One Size
Was using one of these within an hour after receiving.....needed to make 8, 1" inch holes in treated 4 x 4's.....not an issue, worked excellent, a paddle bit would've been destroyed, just let the bit feed itself thru the wood. Good buy for me, thank you
Reviewed in the United States on November 20, 2025 by Amazon Customer
    • Sharp fast work
Size: One Size
Holy smoke sharp and fast work. Great quality and size perfect for tight spaces.
Reviewed in the United States on May 10, 2026 by T. Bear
    • On second thought
Size: One Size
Review Image by don
Updated* tbh I was initially dissatisfied with the quality in packaging, but these things still ripp!!
Reviewed in the United States on August 3, 2026 by don
    • The only? sensible way to run cable through 2x4 studs
Size: One Size
You could use a spade bit I suppose: push, struggle and take a break after the second one. With these bits you pretty much touch the tip to the wood, trigger the drill and sit back and watch. No push required. The threads on the tip suck the bit through the wood. You'll have time and energy to spare, to wipe off the shavings at the far end. The short bit length, ideally in combination with a right-angle drill or adapter, gets you in even when studs are narrowly spaced. If you're a first-time DIYer I strongly suggest you read up on the electrical code on drilling through studs. Do it wrong and you could cause a fire and/or weaken the stud. ... show more
Reviewed in the United States on November 30, 2025 by Enigmatic Techie
    • Excellent, but you have to use the right technique
Size: One Size
When drilling with one-inch bits or slightly larger ones, you need to drill in short, jerky strokes and make a pilot hole so that the threaded bit doesn’t seize up; otherwise, the drill will jam or you’ll strain your wrist, especially if you press the drill down too hard – you practically have to let the bit advance on its own. They’re excellent because they cut very quickly and cause virtually no splintering of the wood. ... show more
Reviewed in the United States on July 11, 2026 by Fernando Velasquez E
    • buenisimos
Size: One Size
funcionales
Reviewed in the United States on August 26, 2026 by anne marie champsaur
    • Good assortment of bits. Nice design.
Size: One Size
I liked the design of these and I needed an assortment in the sizes in this kit. They look like good quality bits.
Reviewed in the United States on July 11, 2026 by Kenneth R. Beamish

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