Thread gauge Draper
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Draper
For restoring and cleaning internal or external threads Thread pitch: 080-100, 175-200, 125-150 and 250-300Packed in clear plastic tube.
Draper 52 Blade Screwpitch Gauge Set, including 0.25-6mm metric and 4-62 BSW imperial blades, accurately measures screw pitch for precision fastening.