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Zhitaoxun 28 Bolt and Nut Identifier Gauge Nut and Bolt Thread Checker 14 Metric & 14 Standard Ruler with Inches and Centimeters On Both Sides: Amazon.com: Industrial & Scientific
stalye Nut and Bolt Thread Checker – Practical Thread Checker Box – Easy to Use Thread Checker Standard and Metric – Compact Bolt and Nut Identifier Gauge Box – 44 Male/Female Gauges - Yahoo Shopping