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Amazon.com: GlowShift 1/8-27 NPT Drill & Tap Kit - 1/8" Carbon Steel Tap & R High Speed Steel Drill Bit for EGT Probe Installation to Exhaust Manifold : Automotive
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XtremeAmazing Set of 5 HSS NPT Pipe Tap Set 1/8, 1/4, 3/8, 1/2 and 3/4 Inch: Amazon.com: Industrial & Scientific
1/8 NPT Tap HSS w/ Bright finish - Induction Solutions
1/8-27 1/4-18, and 3/8-18 NPT Pipe Tap Brand New Norseman / Viking | eBay
Amazon.com: Vermont American 20371 1/8-27 NPT High Carbon Steel Pipe Tap : Industrial & Scientific