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I would like to mention an issue. Small bits of material are easily scraped from the surface treatment of the alloy from which the bayonet is made (as you engage the bayonet to the camera, or while joining the two rings together). This debris could get on your sensor and could be hard to remove, or could scratch the sensor. If you are an adventurous soul, you could try connecting and disconnecting the rings to one another away from the camera, with alternating positions, first one on top, then the other, turning the connector many times and engaging/disengaging the lock, in order to scrape away the parts of the alloy that tend to become loose and to effectively polish the contacting surfaces. You can see the resulting metal debris with a magnifying glass or with your bare eyes (if you are younger than me). Subsequently the debris can be removed by blowing compressed air and using a brush. Make sure no more stuff tends to get loose from the surfaces before you start using the rings on your camera. If you already used them before reading this, check the bayonet on the camera for debris. Of course, this does not guarantee that no more stuff will get loose, so caution is advised. Better still, throw them out and get the originals, even though they cost five times as much.