Included in the ''KIT'' is the Mk III lens hood and the Adapter ring.
The Adapter ring is needed if you wish to use a filter with your Mk III hood.
The Adapter has been designed specifically for the X100VI to allow for the extra movement the lens needs and the infamous Gap has been closed, however it will fit any X100 series camera. It is compatible with most 49mm filters.
A rubber cap is also included.
The following filters have been tested.
Hoya 49mm UV(C) Digital HMC Screw-in Filter,Y5UVC049
Kenko Smart MC UV 370 Slim 49mm
B+W 49mm XS-Pro UV Haze MRC-Nano 010M Filter
FUJIFILM PRF-49S 49mm
Tiffen Glimmer Glass 49mm
SquareHood Mk III + Adapter Ring for Fuji X100 Cameras (Black)