As an experienced machinist, I have a lot of experience with various end mills sets. When I came across the 9 Piece Ball End and SEM Two Flute End Mill Sets, I was intrigued by the inclusion of both ball end and standard end mills in one set. Upon receiving the set, the wood stand is a nice touch and keeps the set organized. However, upon closer inspection, I found that the quality of the mills themselves is hit or miss. Some of the end mills are sharp and work great, while others seem to dull quickly and don't provide the cleanest cuts. In terms of size variety, the set has a good range from 1/8 inch to 3/4 inch. However, I wish there were more options in between those sizes for more precise work. Overall, the 9 Piece Ball End and SEM Two Flute End Mill Sets are a decent option for those needing a variety of sizes and types of end mills, but be prepared for mixed results in terms of quality.