Big Horn 17042 4-Inch Outside Caliper
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<b>[Product Information]</b><br>
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<li>Made of  steel</li>
<li>Hardened fulcrum spring and points for long life</li>
<li>Threaded spool mechanism provides infinite adjustment</li>
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<img src='http://ecx.images-amazon.com/images/I/41hIcSuk1dL.jpg' noproxy></br>