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  • Irwin Industrial Tools 10239CB Unibit 2-Steps Cobalt Step Drill Bit for 1/2-Inch and 3/4-Inch KO
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Irwin Industrial Tools 10239CB Unibit 2-Steps Cobalt Step Drill Bit for 1/2-Inch and 3/4-Inch KO

3 customer reviews

List Price: $116.58
Price: $54.85 & FREE Shipping. Details
You Save: $61.73 (53%)
Only 7 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
  • Enter your model number above to make sure this fits.
  • 6X Longer life vs. the competition
  • M35 grade Cobalt HSS
  • Radial concave flute
  • 3-Flatted shank
  • Speedpoint tip
See more product details
7 new from $47.99

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Frequently Bought Together

Irwin Industrial Tools 10239CB Unibit 2-Steps Cobalt Step Drill Bit for 1/2-Inch and 3/4-Inch KO + Irwin Industrial Tools 10234CB #4 Unibit 3/16- Inch - 7/8-Inch, 12-Steps Cobalt Step Drill Bit (1/16- Inch Steps)
Price for both: $97.24

One of these items ships sooner than the other.

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Product Description

Product Description

585-10239CB Features: -6X longer life. -3-Flatted shank. -SpeedpointTM tip. -Laser marked sizes. Number Of Bits: -1. Unit Material: -Cobalt. Use: -Drill Bits. Dimensions: Overall Product Weight: -2.06 Pounds.

From the Manufacturer

Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10239CB 9 2 Hole Sizes (7/8-Inch and 1-1/8-Inch )for 1/2-Inch and 3/4-Inch KO


Product Information

Technical Details
Part Number 585-10239CB
Item Weight3.2 ounces
Product Dimensions7.2 x 3.2 x 1 inches
Item model number10239CB
ColorBlack
MaterialCobalt
Item Package Quantity1
Warranty DescriptionManufacturer
  
Additional Information
ASINB00126FI0I
Best Sellers Rank #340,166 in Home Improvement (See top 100)
Shipping Weight3.2 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableNovember 9, 2004
  
Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

1 of 2 people found the following review helpful By T. Carter on January 3, 2013
Verified Purchase
I purchased this Unibit to convert stainless beer kegs (purchased legally from a brewery, not stolen!) into a 15 gallon system for home brewing. I had 8 holes I needed to drill out to ~1" to accommodate a 1/2" stainless female coupler. I did my best to keep the RPMs and feed rate down as to not work harden the stainless but despite my best efforts, the bit really struggled from 3/4" on. Part of the problem was maintaining the proper speed and feed with a hand drill but part of the problem was the burr formation on the bit as I used it. This started to happen around hole 5 and was somewhat surprising considering the hardness and price of this bit. Once the burrs formed, hence dulling and generating heat, my speed was no longer the problem due to the bit's inability to cut. The bit really struggled to make the 1" hole even when new but cut very easily through the stainless for smaller holes. Perhaps a large drill press would do the trick but this was not practical for my use. If using this bit with stainless, watch your speed and feed and keep it cool as possible and stick to smaller holes. My bit will never cut another hole above 3/4" which is very disappointing considering the price I paid for it.
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By Nicholas Cole on June 5, 2015
Verified Purchase
It might be the single cutting surface, but this was the slowest bit I have ever used. It created a lot of heat as well, the only positive was the spacing in the middle that made for a clean accurate hole.
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By Joseph Evans on March 24, 2015
Verified Purchase
Item just as described, fast shipping
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Irwin Industrial Tools 10239CB Unibit 2-Steps Cobalt Step Drill Bit for 1/2-Inch and 3/4-Inch KO
This item: Irwin Industrial Tools 10239CB Unibit 2-Steps Cobalt Step Drill Bit for 1/2-Inch and 3/4-Inch KO
Price: $54.85
Ships from and sold by Amazon.com