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High quality 316L surgical stainless steel ball closure ring (BCR) finished in PVD black with a gauge of 5mm. This BCR is easier to fit/remove than a standard ball closure ring, thanks to a pair of spring-loaded domes which are located on either side of the ball. When the ball is correctly positioned inside the ring, the two domes sit snugly inside two small cut-out circles at the ring ends. To fit the ball, press the two domes inwards with your fingers. Next, position the ball so that the two domes are ready to ping into the two cut-out circles, and then release your hold on the domes and push the ball into position. The two domes will pop into the circles, which in turn will hold the ball securely in place. To remove the ball, just wiggle and pull it slightly. This steel ball closure ring is available in a choice of internal diameter sizes between 16mm and 19mm (other sizes may be available, please ask).