uxcell 1/4-28 UNF Straight Flute Tap Left Hand and 5.4mm Twist Drill Bit Set, Titanium Plated High Speed Steel Drilling Bit Machine Threading Tap - Amazon.com
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UNF 1/4" x 28) - 5.5mm Tapping Drill. Highest Quality. Free UK Shipping.
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IRWIN HANSON 1/4" - 28 NF Tap and No. 3 Drill Bit Set, 80232 - Core Drill Bits - Amazon.com
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