These cutters do not fit the Hougen HMD150 drill. They were offered for sale at the same time, but they don't fit. Requires Rotaloc Plus cutters. I kept one set for myself (can be used in other existing drills) and returned another set. So I can't directly comment on how these tools are made or used as they weren't the cutters I expected or needed a new drill bit. Perhaps I should have delved deeper into the whole compatibility issue and not assumed that Revane's suggestions are correct.
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