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CoPilot Hole-Enlarging Adapter for Shark Tooth® Hole Saws

Easily enlarge an existing hole with a larger hole saw—just install in place of the pilot bit to guide the cut.
Item #

If you've used a hole saw to drill a hole and then find out it's too small, Century's patented CoPilot adapter lets you enlarge it while maintaining the same precise hole location. Just install the CoPilot in place of the standard 1/4'' pilot bit and mount the original hole saw—or one that matches the existing hole—to the CoPilot to guide the cut. You can then drill the larger hole in one easy operation while the smaller hole saw keeps it perfectly centered. Made in USA.


  • Lets you easily enlarge existing holes in one easy cut
  • Compatible with a range of threaded arbor styles, sizes and brands (sold separately)
  • Larger hole saw (sold separately) cuts new hole
  • Smaller hole saw (sold separately) becomes the pilot
  • Use Adapter Nut (#53258, sold separately) to convert threading from 1/2-20 to 5/8-18 if required
(1) CoPilot Hole-Enlarging Adapter for Shark Tooth® Hole Saws
More Information
Manufacturer Part Number 5320
Weight 0.2000
Tech Spec
  • Minor Shank Diameter: 1/4''
  • Threading: 1/2''-20
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Why did you choose this?
Rockler Store
Christmas gift for my Husband.
Joan V on Dec 21, 2019
Christmas gift for my Husband.
Joan V on Dec 21, 2019
Will this work with other brands of hole saws if they are the threaded arbor type with the two lock pins. I have a large Milwaukee kit?
Strick on Nov 1, 2019
BEST ANSWER: I just tried this with my milwaukee hole saws. Milwaukee is a different size - but I think if you got a shark tooth inner saw it would work with your milwaukee outer saw. That's what I'm about to try.