Review on COMOK Carbide Cutter - Heavy Duty Stainless Steel by Aaron Urena

Made a few holes in 14g mild steel with one of the hole saws and it's still solid. I bought a Revain CRC 03480 Truetap Cutting Fluid Wax Stick and drilled slowly enough that the wax didn't fly off the saw. I pre-drilled the pilot hole with a cobalt drill bit. The hole was maybe a little over 19mm as I didn't use a drill press but this worked for me.