Good quality inserts. As far as I know, no worse than Ken's Metal. I'm not a commercial locksmith, but I do mechanical work on a regular basis. They work great with both soft and slightly hardened steel. I also use it successfully on stainless steel.
POWERTEC 62-Inch 8-Inch Blade - Model 13132X
12 Review
πͺ Bi-Metal Cutting Blades: Imachinist S933414 - Enhancing Precision and Performance
10 Review
πͺ Durable DEWALT DW3986C Portable Blade 3 Pack for Efficient Cutting
10 Review
πͺ DEWALT DW3984C Portable Blade Set of 3-Pack
10 Review