4 mm Ferrule
The Ferrule is deep drawn from steel sheet metal, and includes a 4 mm diameter hole at one end that allows a length of 4 mm plastic tubing (e.g. 4 mm nylon tubing) to be inserted all of the way through the Ferrule. A 6 mm opening at the other end allows the Ferrule to receive and retain the end of a plastic tubing spring cover.
The Ferrule also features an attractive, polished, chrome-coloured finish on its outer surface.
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