Designed to protect the bulb of a Flashpoint Xplor 400 or Godox AD400. Clicks into the bowens mount and covers the bare bulb. I wanted something to replace the 2 piece cover it came with because it kept falling off and I didn't want to remove the bulb in transport. V2 - Version has tighter tolerances for Bowens connections. Total height is 84mm giving you 10mm of clearance above bulb.