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COMOWARE Cobalt Drill Bit Set- 29Pcs M35 High Speed Steel Twist Jobber Length for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic with Metal Indexed Storage Case, 1/16"-1/2" - Amazon.com
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Yeshfit 1/2 Dia,Micro Solid Tungsten Carbide Uncoated Tip Twist Drill Bits for Stainless Steel,Hardened Steel CNC Metal Drilling (1/2x3, for Aluminum) - Amazon.com
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