Irwin Tapered Countersink Drill/Drive Set (1890451) - Canadian Woodworking

A convenient and useful all-in-one drill bit/counterbore/countersink set for shop and job site use.

Irwin Tapered Countersink Drill/Drive Set (1890451)

Irwin Tapered Drill/Drive Set (1890451)

In many cases it's much more economical to purchase drill/driver accessories in sets rather than individually. This new tapered countersink set from Irwin gives you 14 driver bits in three common head types (Torx, Phillips, and Square), plus the 4 most common tapered bits (#4, #6, #8, #10), a stop collar, Allen key, and a durable storage case. The kit retails for around $58, which makes the per unit cost for the 18 bits $3.25. 

Forged impact ready bits

The driver bits are made from heavy-duty, cold-forged, high-grade steel. You get 6 Torx bits: T8, T10, T15 (3 pieces), T20); 4 Phillips bits: #1, #2 (3 pieces); and 4 Square: #0, #1 (2 pieces), #2. The Torx bits are milled, while the Phillips and Square bits are forged. All the bits have a black oxide finish meant to resist corrosion and increase bit life. An added bonus is that these are impact ready bits. Standard driver bits generally aren't strong enough to withstand the high levels of torque generated by impact drivers. A typical impact driver can apply upwards of 1,600 in-lbs of torque and 3,600 impacts per minute. This puts considerable strain on driver bits, causing them to heat up, which can lead to metal fatigue.

Since this is a counterbore/countersink set, my preference would have been for a wider array of Square bits with a few Slotted bits, and fewer Torx bits, which are more commonly used by electricians than woodworkers.

Replacement bits are available in a full range of tip styles (Phillips, Square, Slotted, Torx, Hex) and sizes from 1" to 6". 

Only time will tell how well these bits perform, but my experience with other Irwin products gives me a lot of confidence.

Bits can be used in three configurations

The real appeal with this kit are the four tapered drill bits. The benefit of tapered bits is that their profile better matches the shape of screws – as a result, the screw threads obtain a much more secure grip in the screw hole. Notice the wide, deep flutes on the bits – these enable the bit to sink faster and make cleaner holes. The 1/4" hex shanks allow you to mount the bits in your drill much faster than round shank bits, and they hold a heck of a lot better.

Each bit comes with its own counterbore. Two hex screws on the counterbores attach them securely to a flat milled on the shank of the drill bit. I've used two-flute counterbores in the past, and find they cut more quickly than these four-flute counterbores. However, I would expect that the four-flute counterbores will last a lot longer, as wear is being spread across four cutters rather than two.

There is one stop collar and an Allen key. With the stop collar attached onto a counterbore you can drill countersinks.

Drill hole, counterbore, countersink

The photo above shows the three hole variations that you get with each drill bit. In use I found these drill bits cut quickly and cleanly. The counterbores did a good job of removing debris from the holes, and gave a clean enough cut.

A hand set for shop or tool box

The Irwin Tapered Countersink Drill/Drive Set is a well priced set convenient for use in the shop, and just as handy to carry in your tool box for use on the job site. The accessories look to be well made, and should give decent service. 


  • 14 driver bits: T8, T10, T15 (3), T20, Phillips 1, Phillips 2 (3), Square 0, Square 1 (2), Square 2
  • 4 drill bits with countersinks: #4, #6, #8, #10
  • Depth stop and hex key
  • Sturdy storage box

SOURCE:Store Locator
July 2014

Carl Duguay
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