The MulWark Drill Bit Set was ordered to add to my tool box. I was impressed with this countersink bit set. According to the product description, this drill set has a hardness of HRC 62-64 and should therefore offer excellent cutting performance. I have found that drill bits work reasonably well in the different types of wood I use and give good results when countersinking holes in wood. The countersink angle is 82 degrees, which is equivalent to 82 degree screws. is in your workshop. I have found that the drill bits in the countersink portion of the set are easily interchangeable. I also found that the actual drilling and countersinking didn't split the wood, which is a definite plus. I haven't tested anything other than wood, so I can't comment on the drill set's versatility for other types of products. CONCLUSION: This is a good set of countersinks at a reasonable price. The bits and countersinks appear to be well made and hopefully durable. I would order again.