Gel holder, bowens to bowens.
This is a bowens to bowens gel holder. I'll link an instructional video in a bit.
Made to work with https://www.amazon.ca/Speedlite-Bracket-AD200Pro-AD400Pro-Reflector/dp/B07YDPL4GM/ref=asc_df_B07YDPL4GM?mcid=e2fb936b3e84350b9874827945827492&tag=googleshopc0c-20&linkCode=df0&hvadid=753788258765&hvpos=&hvnetw=g&hvrand=16528384010383107326&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001186&hvtargid=pla-940438105914&psc=1&hvocijid=16528384010383107326-B07YDPL4GM-&hvexpln=0&gad_source=1
It may or may not work with other fixtures.
Any questions or kudos- find me on Instagram at @brodiehasacamera