Under the microscope they looked fine at first - some cut edges were chipped but high enough for a 0.005 engraving to be ok. But after doing the job with conservative settings I see that they are pretty terrible. I get better results in bronze, copper, and silver with standard circuit board cutters that are half the price. They may be suitable for softer materials but overall I was very disappointed in them.
Ultimate Guide to KOWOOD Router Pieces for Woodwork Beginners
11 Review
High-Performance Whiteside Router Bits UD2102 Compression for Precise Woodworking
10 Review
Multitool pliers GANZO G202 black
12 Review
Enhance Woodworking Precision with Roundover Milling Rounding Edge Forming Tool
11 Review