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6pcs Square Hole Mortise Chisel Drill Bit Tools, 5/8" 9/16" 1/2" 3/8" 5/16" 1/4" HSS Woodworking Hole Saw Mortising Chisel Drill Bit Set, Different Sizes - Amazon.com
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Fisch Mortise Chisel & Bit Set 5/8" Diameter x 3/4" x 9-3/8" Overall Length FSG-373131 from Fisch - Acme Tools
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