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Amazon.com: 13 PCS Metric M35 Cobalt Steel Twist Drill Bit Set HSS Extremely Heat Resistant with Straight Shank to Cut Through Hard Metals Like A Hot Knife Through Butter,Such as Stainless Steel,Titanium
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uxcell Twist Drill Bit Set 3mm 4mm, HSS (High Speed Steel) 4341 Titanium Nitride Coated Straight Round Shank Drilling Tool, for Stainless Steel Alloy Copper, 10pcs - Amazon.com
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