Extractor fingers fit into flutes of broken tap and a few turns of a tap wrench removes broken tap. Size: #4 (3mm).
NEW Walton 10043 #4 3 mm 3 Flute Tap Extractor Replacement Finger (BN269)
#4 3mm Walton 10043 Tap Extractor 3 Flute USA
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#10 Walton 12104 4 Flute Tap Extractor Replacement Fingers USA Walton Set of 4
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NEW Walton 10042 #4 3 mm 2 Flute Tap Extractor Replacement Finger (BN268)