10 x 6mm Stainless Steel Ball M3 tapped
About Balls: The size reference (3mm-12mm) is the actual ball size. The balls are 6mm diameter and come with a M3 tapped hole for use with metric M3 threaded bar.
This pack contains 10 x 6mm balls with a M3 thread
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These balls are inexpensive and perfect for making joints, although I sometimes wonder if I shouldn't just get the Pro ball joint as it is so reasonably priced and nicely constructed.