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O-Ring Gauge Make Work Smart, Telescoping O Ring Sizing Plastic Gauge, Slide Style National Type, for Measuring O Rings Inner Diameter, OD, Thickness Gauge Black: Amazon.com: Industrial & Scientific
VERMONT GAGE, #8-32 Thread Size, Go/No-Go (Plus/Minus), Threaded Ring Gauge - 413N40|361117550 - Grainger
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