ZELCAN 5-Piece Titanium Coated HSS Step Drill Bit Set - 50 Sizes in 1 Kit for Metal, Wood & Plastic - High Speed Steel Unibit with Aluminum Case - Perfect for DIY, Home Improvement & Professional Metalworking Projects

First of all, I truly believe the old saying that you get what you pay for....so take this review for what it's worth. The cost of these drill bits was very inexpensive. I don't need or use them all the time. In fact I've only used them once to drill through structural steel framing on my RV to add under chassis storage. They performed very well and cut through the steel like it was butter. I drilled 1/2" diameter holes after setting a pilot hole. I cannot vouge for the longevity or how they will hold up, but if you're a home DIY'er, these should be adequate for most projects. If I ran a shop and used these frequently, it might not be the ticket, but again for the price, these things are disposable. They come in a small metal case to hold them, which is nice for storing. I can't knock them at this time.