Based on my experience, these replacement screws were a complete DISAPPOINTMENT.The screws were of such low quality that they strip with little effort, making them useless for any industrial and scientific applications. The only positive aspect is that they shipped on time. Save yourself the hassle and look elsewhere for quality replacement screws..
I think these screws are actually an improvement over the original screws found in economy tool holders. On them, the key fits the socket better than the original, as if the socket was deeper? If you use carbide indexable inserts, you should have them in your tool box.