Review on 🛠️ COMOWARE Step Drill Bit Set & Automatic Center Punch Toolkit: Unibit, Titanium Coated, Double Cutting Blades - 5pc Short Length Drill Bits with Aluminum Case - 50 Sizes in High Speed Steel by Bill Forbis

This is NOT very good. For the price I should have known. I upgraded my microbrewery tanks and the first 2 tanks (stainless steel) cut through fine, but I spent 3 hours cutting the final hole in tank #3. After the first refueling, he lost the edge and only heated the stainless steel and bit. By repeatedly drilling, chilling, hammering and repeating, I made the 3rd hole. It's so cheap I just throw it away and don't think twice about it. If you want to add something to your toolbox look elsewhere, if you need to make a one-time change you can.