Review on 🔷 Premium CO Z Cobalt Aluminum – Available in Multiple Sizes for Ultimate Versatility by Robert Lewis

Excellent value for money. However, if you intend to use them on tougher materials (like 316L or 304 stainless steel), think again. I've used them on aluminum and they work great. Various gauges like 3/8" and under worked fine. Unfortunately, after just one use on 1/8" type 316L stainless steel, it was destroyed with a larger cutter. See photo. Same goes for the slightly thinner 3/32" stainless steel type 316L. Look at the picture of the broken 3/16-7/8 bit. In short, soft materials are great. Hard materials are absolutely not suitable.