Kase makes the filter holder from aviation grade aluminium, which is CNC-milled. This makes it strong and lightweight.
It also has a locking mechanism that helps prevent it from being accidentally removed from a lens.
Kase includes 67mm and 62mm adapters to mount the filter holder on a lens. These can be used on lenses with smaller filter threads via step-down rings.
As usual, the adapter screws onto the end of a lens and the filter holder mounts on to it. The holder has a slots that can accept three rectangular or square 1.1mm thick filters.
Ingeniously, the kit also includes a 67mm magnetic polarising filter. This mounts at the back of the holder, close to the lens front element. A dial or cog on the side of the filter holder allows the polarising filter to be rotated into the correct alignment.
Helpfully, the filter pouch has slots to house a small collection of filters and the holder. It has interchangeable short and long straps, plus a Velcro-fastening loop to enable it to be carried or fixed in a convenient location.