Irwin Tools IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)

I used to use bits like these when I installed whiteboards and projectors in schools for a living. I used them for cutting holes in the pole that connects the ceiling bracket to the projector mount, because often I had to cut the pole down and so the factory-machined retention hole would be lost at one end. I have found them to be the fastest way of drilling thin walled metal (< 4 mm) round and square pipe on site, and they leave a clean circular hole with little to no burr. They are also good for drilling plastic if the need arises. This Unibit has stayed sharp and true for my home usage requirements. I've used it manufacturing gym equipment at home and for making existing holes bigger. I give this product 5 stars.

I bought this after looking at countless drill bits to find the best one for drilling out the endjack for guitar pickup install. It is a high end $3000. guitar so if I am taking a drill to it i any way, shape, or form, it needed to be the best. A fine guitar is made of fine woods and a fine finish so a drill bit which rips or tears at the finish or even leaves a scratch or rough spot at all is a deal breaker. This bit was easy to use, sharp, and made a very nice clean hole for my endpin jack install. I don't typically write reviews but wanted to write one for this bit for the benefit of other guitarists that are looking for the right drill bit for installing endpin jack for their pickup. The pickup I installed was a K&K pure mini and the guitar is my Martin CEO-7. I had never installed a pickup before and this 1/2 inch unibit worked perfectly. It will get the job done neatly. Of course, make sure you also use blue painters tape on any guitar to protect during drilling.

This step bit is excellent, just like all my other Irwin step bits. It's difficult to find any tool store (even specialty) that actually carries metric step bits. Instead of driving all over town like I did, just order one from here if you need it. My actual use case for this is to bore out props for electric RC planes and multi-rotors. As it's a step bit, it more or less self centers in the hub as I'm drilling, as long as the hub is starting with at least a 4mm hole. I'm boring to 5 and 6mm typically, and this works perfectly. Doing the boring on my drill press as opposed to by hand with a prop reamer is also much easier and less time consuming.

Fairly cheap but seem good for money, fast drilling so far for what ive used it.

I had to drill 7/8” hole in 1 1/4” tubing on one side only, and so, I couldn’t use full size step drill bit for being too long. This half size bit did the trick beautifully. It’s very sharp and the hole came out very clean. I’m very happy to find this unique bit.

Irwin has always been a great Step Drill when used as it should be with sheet metal. I have used this brand for years when I was building street rods.

Needed fo a project to enlarge a mounting hole for an axle on a lawn trailer. Worked perfectly, round hole unlike a typical twist drill bit.

This is the second one of these I've purchased. The first one lasted 5-6 years and is still working OK but its one of those tools I could not do without and wanted a second as a back-up. If you're an electrician, you are missing the boat if you don't have one of these unibits. Besides the ability to drill such a wide variety of hole sizes, this puppy is perfect for reaming the burr from the inside of EMT you just cut with a tubing cutter or hack saw. I don't know how the cheaper ones hold up, this one holds up for years.

Cuts like a hot knife through butter!

BUENISIMA LA BROCA TENGO UN TALLER DE FSABRICACION Y A LA GENTE LE GUSTO MUCHO COMO SE TRABAJA NADA MAS SI HAY QUE DARLE DESPACIO PARA NO QUEMARLA PERO ESTO ES EN CUALQUIER BROCA

Factory sealed never opened exactly what I needed

Very good.

fue cara, pero tiene calidad.