The difference? About $.15 each. And amazingly, the ones on the left actually work quite well. I was surprised the first time I used them. In some steel they actually work better than the cut ones.I use ones that look like the one on the right. Even the same finish. I think they were "TEKS" brand, but I bought a large quantity a long time ago. On mild steel you could drill/tap several holes with the same screw.
The one on the left looks.........cheesy somehow. Is it any good?
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