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Tools for finding the size of an external screw thread

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BoltSize-It Bolt and Nut Checker
3459 BoltSize-It Bolt and Nut Checker    
$4.95  
Screw Checker, Inch, PEC
3029 Screw Checker, Inch, PEC   Made in United States
$23.95  
Screw Checker, Large Metric, PEC
3031 Screw Checker, Large Metric, PEC   Made in United States
$26.95  
Screw Checker, Plastic
3461 Screw Checker, Plastic    
$4.95  
Screw Checker, Small Metric, PEC
3030 Screw Checker, Small Metric, PEC   Made in United States
$25.95  
Tap and Drill Gage, Starrett "Time Saver"
3550 Tap and Drill Gage, Starrett "Time Saver"   Made in United States
$83.00