IRWIN Step Drill Bit Set, 4-Piece (10225) - High-Speed Steel Multi-Purpose Hole Cutter for Metal, Wood, Plastic - Perfect for DIY Projects, Electrical Work, and Home Repairs

Great quality. Worked good on steel 1/4"Great for steel. I wasted a nice chunk of money on other step bits, including Milwaukee impact ready, HF "titanium", Klein black oxide, etc. I use these to drill steel up to 3/16" thick. They cut quickly in a hand drill with minimal oil (horizontal position) and, so far, do it without dulling. I wish I had bought these first.Always wanted bits like these, not sure how I have went without themThe IRWIN step drill bit set is good quality and the reason I give it only 4 stars is because one of the step drill bit shaft was bent from the factory with a wobble, I expected better quality from ERWIN, I would still recommend, but check the quality first for any possible defects.I'm doing a fiberglass car project, and these things leave much nicer edges than my normal pilot point bit sets. And even on un-masked gelcoat, this leaves minimal cracking. (Though I'd still recommend using masking tape, and cutting in towards the gelcoat).I like the right-most one, which has long steps -- it helps get nice straight holes, even through a fairly thick piece of fiberglass. The only minor thing is that I wish that there was more variety in sizes. The bigger one is, if I recall correctly, 3/4" at the largest. If the set had a narrow, medium, large one, it would be slightly more versatile, than the current set which has 2 narrow ones, and a medium one.Arrived today didn't use yet but seem like nice bits, only thing is they came in a cloth zipper bag with black foam inside to hold them in place, not a big deal just not the metal case in the picture, I get a little frustrated when I get something other than what I'm shown.The quality I expected from Irwin. I was able to drill up to the 1 and 3/8th of an inch, definitely can go beyond. I only needed this to complete a customers request. I suggest using a good cutting oil to protect your investment. I was cutting though 1/8 inch mild steel. I have found that when it comes to a mechanics need for good bits, Irwin has never let me down.These drill bits are pricey but they will outlast any cheap sets offer by other companies. They seem to be the best drill for sheet metal and steel.Boitier differe de celle sur la photo,n’enlève rien au produit mais recu dans un boitier semi rigide au lieu du boitier qui semble etre en metal!!La photo devrait etre mis a jour!On s’attend à recevoir ce qui est sur la photoPerfect