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Title: Buy a couple, you'll need them
Review: I use these in a jasper circle jig to cut holes for mounting speakers. After 6 4.5" circles the bit was already dulled enough to heat up and began burning the wood instead of plunging through it smoothly. There is also already grooves in the cutting edges that leave their shape in the cut edge of the material. Very disappointed... My Freud 75-102 was a far superior bit.
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