The Profoto 5 Degree Honeycomb Grid is for your small, lightweight, and easy-to-use D1 Studio Kit.The grid reflector helps to control the light beam and prevent light spill from a D1 flashThe Profoto D1 Monolight grid a very narrow 5° beam of light is achievedAttach the  Profoto 5 Degree Honeycomb Grid directly to the front of the flash head with the built-in mounting clips and you don’t require a grid holder for this