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These are set up bars for getting your router, table saw, or other equipment to a precise height. Kreg and Powertech both make sets that cost at least twice this. Even for the imitations, this looks like a good price.
Price: $ 20.99 minus 10% coupon, $ 18.89
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The kit includes 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2" bars and a plastic case.