This Lastolite Flash Mount Adapter for the Ezybox II Hot Shoe Flash Softbox is made to allow your Quantum Q flash to work with the Ezybox II. Because the Quantum Q flash has a unique physical design, this workaround interface is required.
First, affix this adapter to your flash. Next, this adapter affixes to the #2414 Ezybox Bracket, and then you've got a system that will work with all of the remaining Ezybox accessories such as extending handle, tilting head, etc.
The Quantum Q flash is larger and more powerful than normal shoe-mounted flashes, and as such can particularly benefit from the larger Ezybox Hotshoe softbox (B&H item code "LAEBHSB24").
Quantum Q-Flash Series Flash Mount Adapter for Ezybox II Hot Shoe Flash Softbox