Expand your lighting options with this 105mm Ring Flash Head Adapter Ring, which will enable you to use INON Z220 and Z240 strobes with the ULTRAMAX Fiber-Optic Ring Flash Head Kits for Fantasea and Aquatica underwater camera housings. It's compatible with kits that have model numbers ending in "DS1." In addition to the INON strobes, the adapter works on other flash units that have front diameters of 85-105mm.