Flare ends are available in sizes 3/8" and 5/16" while most threaded grease fittings are 1/4"-28 sizes are 1/4" and 3/8". Also, there is no marking anywhere on the tool to indicate the size of the coupling or the size of the thread/tapping tap. It is blank everywhere. Grease nipples I found with metric threads (6 mm x 1.0) have 1 hex socket / 4" and 3/8" threaders/tappers and extractors are useful but the socket ends are useless.
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