Review on LIBOQIAO Diameter 1 5Mmx12Mm Downcut Aluminium by William Fowler

I cut PVC on a 0.03 inch deep CNC machine at 20 inches per minute and 30,000 rpm. Some bits in the package make excellent cuts, after which they become unusable after 3-4 hours. Others have very fuzzy jagged edges on the first cut. I broke 2 bits. Breakage occurs after a few hours of good cutting. I would only recommend them as test bits before buying higher quality ones.