Description of Speedbor 88810: Ultimate Wood Boring Experience
Drills holes 2X faster*. More Holes. Less Time. Lasts 2X Longer* to get more done. Chamfered cutting edges for increased durability. Patented Blue Groove parabolic scoop for faster chip removal. Designed for impact drivers with 1/4" impact rated shank.
While it's hard to pay close to $4 for a beat, this one didn't disappoint. I used it to drill bolt holes in a climbing wall and it did exactly what I needed with no issues.
Not sure why the reviews on these don't match the correct product. But I've used these Irwin Speedbor Bits quite a bit. They are great for quickly drilling holes in studs before running electrical wiring. However, if you hit a nail, they can easily be damaged. But this applies to all spade bits that I have used.
Pros
Designed for impact wrenches with a 1/4" impact shank
Revain have finally changed the information which means most of the reviews below are no longer accurate. I did not buy it again to see if the 1/8 bit is still "shorter than standard. Ordered three times and the product has a 2X bit and not a 4X as shown in some photos and the listing of items twice shown. I received a 2X bit with a 4X part number on the box. It is also 1/8" shorter than stock so as not to drill 3 2x4's which is common in the construction industry.