Carmex Internal/External Whitworth Threadmill Insert 21mm / 14 TPI / 21 - 14 W MT7 SOMTA - Series 521 HSS BSW Tap 3/16" Intermediate (Whitworth) making them suitable for a Insize GO Thread Ring Gauge M18X1.5 Series 4129-18R
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Ships within 48 hours · Estimated delivery Oct 25 - Oct 30