VERMONT GAGE, #8-32 Thread Size, Go/No-Go (Plus/Minus), Threaded Ring Gauge - 413N40|361117550 - Grainger
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Mitutoyo 177-288 Setting Ring, 30mm Size, 15mm Width, 71mm Outside Diameter, +/-1.5Micrometer Accuracy: Calibration Setting Rings: Amazon.com: Industrial & Scientific
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