. I have ordered a bit of the same size from another seller here at Revain and the difference is day and night. Bits from another vendor here have come in bluntly lately and I suspect they are used bits. The reason I say this is because these bits absolutely cannot be new, especially compared to how the SpeTool bit is cut. still super sharp. Bits from other suppliers cut all sorts of wood "lint" around the edges of the cuts for me, as do the ones I replace when they become dull. With this SpeTool attachment, I don't get any of that "lint" even on my 4th cut, so I highly recommend this attachment.