
Overall I've had very good results with Yonico cutters. In my first cut, I drew 11 1" letters about 3/16" deep using the 1/4" bit from this set of long auger bits. The cuts were smooth, but when I removed the bit from the chuck , teflon coating peeled off about 1/4" behind one of the carbide surfaces. Missing on one of the carbide surfaces. Your bits used to be a good deal for light work but with the quality I've been getting lately I'll be switching brands.