What diameter strobe will this fit?
Not sure what strobes this will work on. It's made specific to fit the zylight Z90 LED light. The outer ring that slides over the front of the light you're putting it on is 3 and 1/8 inches and not adjustable in any way. The inside of that ring that will actually sit on the barn door holder is 2 and 5/8 inches wide. So basically the barn door holder you're sliding this into needs to hold 2 and 5/8 inches. I hope this helps! Good luck.