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I bought these because they work well. Apparently most new spade bits use a cork screw design, which is fine, but it forces the bit to be drawn into the work by the screw threads and does not give you any control over feed. These Irwin bits which do not have a screw thread allow you to control the feed rate into the material, which I find is much better.
Verified purchase: Yes | Condition: Pre-owned
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