Round Threaded Female Plastic Ball Knobs or Plastic Female Threaded Round Ball Knobs, Bakolite Ball Knobs, Nylon Female Threaded Balls, FeMale Thread Balls, Female Threaded Ballknobs, Female Ball Knobs and Female Threaded Control Ball. The Dimensions we refer to are firstly the approximate Grip Diameter followed by the Thread Form, usually with an Integral Thread or a Metal Insert but if you don't see the Size or Thread Form you need then consider using a different grip pattern.
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