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61950 Norseman 169D Aircraft Extension Drill Bit, 12in, M42 Cobalt, Wire Size 21 [NDT-61950] : Aircraft Extension Drill Bits - $9.79 EMI Supply, Inc
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BOSCH CO2147B 1-Piece 5/16 In. x 4-1/2 In. Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum - Amazon.com
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