I bought these bits expecting medium to low durability. I was pleasantly surprised to learn quickly that this is a REAL OFFER. I was particularly impressed with the cylindrical chisel, which also has a "square" bottom with moderately aggressive teeth. This allows me to "smooth out" the bottom of a cut made with the same drill in the horizontal direction. (hard to explain - you can easily line up the bottom of the cut and leave the rounded edges at the bottom). it's done with precision - direct and true. The small plastic case is a little awkward to open until you get the simple logic - then it's easy. I CANNOT BE MORE IMPRESSED OR SATISFIED! ! I will definitely consider other products from this supplier. I set my Dremel tool to 15,000 RPM and was amazed at how easily I could control the tool when cutting and shaping mild steel. I don't know how they will perform with higher grade steel.
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