1 Package of 50 Gunmetal (Black Oxide) 2 Inch Ball Pins. The ball on the end of the ball pin is approximately 2mm in size. The Ball Pin is approximately 2 inches Long which equals 50mm. The Ball Pin is approximately 0.5mm thick which equals 0.02 inches which equals 24 gauge. Ball Pins are excellent findings to use for making jewelry. Ball Pins are great for making earrings and dangles for bracelets and necklaces. You can easily twist our ball pins to get that perfect wire wrapped look. The ball on the end of the ball pin gives a great looking finishing touch to every piece of jewelry.