6 Packs Combination Drill & Taps Bit Set, Screw Tapping in SAE Size 6-32nc 8-32nc 10-32nc 10-24nc 12-24nc 1/4-20nc with Anti-Rust Black Coating, 1/4” Hex Shank and Storage Case

It's a perfect set for my occasional needs.

These are great drill/taps taped 8 holes on a mill in 1/2” aluminum had great luck nice threads. Everything‘s good. I would recommend this set..

The set came complete, the finish on the bits looks a bit suspect (black paint?) but they seem sharp enough, and for the money this looks like an OK deal if it works. And it mostly does/did.The first hole I tried was in 0.2" thick simple steel (a galvanized bracket) with the #12 NC bit, and it broke the moment it got halfway into the tapping operation. First hole, first pass, maybe the steel was a bit extra steely, but that was disappointing so there goes a star.Flip-side, I've now done about 40 holes into 1/4" thick brass with the 1/4" NC bit, and no issues although the bit is starting to get dull. Then again, fair enough after 40 holes, and impressive enough to not lose 2 stars over the #12 bit.The other disappointment (and the description was clear so no complaint there, just wish-it-would-have) is that in metric the set goes up to 10mm which is 0.4-ish inches, and in NC it only goes to 1/4" so a little over 6mm. Having 5/16" and 3/8" NC bits included would have made this a MUCH more useful set for me.

Initially I thought these were a great deal. I only needed to drill and tap 4 holes. I used them at a slow speed and used oil to lubricate the bit. It took 3 bits to get through 2 holes because they shatter with the slightest pressure. Then I was faced with a broken tap stuck in the hole that I ended up moving the hole. I didn't even attempt to use these any more because the broken taps in the holes was a much much greater problem to deal with.

It's work great get it

Arrived on time....worked perfectly

Timely delivery,bits are brittle

throw away s, worked good for one hole