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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 FSG-320517 Premium Hollow Mortise Chisel & Bit Set, 1/4-Inch, 5/16-Inch, 3/8-Inch, and 1/2-Inch Size – CT Power Tools
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CHARNWOOD Professional Quality Hollow Square Mortice Chisel & Bit Set 3/4" Size 5060281691804 | eBay
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