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)
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Lucas Oil SAE 80W/90 Gear Trans & Diff Differential Oil 10043 (4 Quarts)
NEW Walton 10042 #4 3 mm 2 Flute Tap Extractor Replacement finger (BN269)
5/16" 8mm Tap Extractor Walton 10314 4 Flute USA