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CO-Z Step Drill Bits, HSS 5PCS Titanium Step Drill Bit Set, 50 Sizes in 5 High Speed Steel Unibit Drill Bits Set for Sheet Metal with Aluminum Case, Multiple Hole Stepped Up
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BOSCH CO2147 5/16 In. x 4-1/2 In. Cobalt Drill Bit - - Amazon.com
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uxcell 1.2mm Twist Drill High Speed Steel Bit HSS-Co 5% M35 Cobalt for Steel,Copper,Aluminum Alloy 5pcs - - Amazon.com
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COMOWARE Cobalt Drill Bit Set - 13Pcs M35 High Speed Steel Twist Jobber Length Drill Bit for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic, 1/16"-1/4" - - Amazon.com
RUKO 215215 HSSE-Co 5 Twist Drill Set, DIN 338, 25 Pieces: Amazon.com: Tools & Home Improvement