These sets are impressively priced and easy to test. The shanks are round and straight to within .0005" and machined smooth enough to easily fit in the collet and fit snugly. The sharpness of the cutters is quite good, but not polished, so they probably hold their sharpness no worse than mid-range bits. They come in durable plastic holders that protect them when stored indefinitely. or just copy what was on a "reference" beat, but I won't experiment to find out. I think you have to ask yourself