Introduction:
It fit for all standard 4x4" 4x5" 4x5.65" filter. (such as Lee Hitech Tiffen Singh-Ray Cokin Z Pro etc.) The Holders fit onto the camera lens by snapping on the adapter ring to be screwed onto the lens. Make sure your adapter ring corresponds to your lens diameter. Also the filters suitable for standard matte box, you can put the filter into the matte box filter tray, makes it easy to change between different lenses when your camera is sitting on the rig. What we need to do is just to pull out the matte box filter tray and pop in the filter, which is for all lenses of different sizes, saving us much more time and bringing us much more convenience.
For the filter holder, there are three screws on the ring to keep the filter set much steady. It can be precisely adjusted and attached to the lens by means of a screw-in adapter ring. A change of camera or of lens necessitates only a change of adapter ring, not the Filter-holder nor the filters.

Package includes:
1x 100x100mm Full ND2 Filter
1x 100x100mm Full ND4 Filter
1x 100x100mm Full ND8 Filter
1x Filter Holder
1x 55mm Adapter Ring (52/55/58/62/67/72/77/82 mm is optional)
1x 3-slots Filter Case
1x Cleaning Cloth

(PS: camera, matte box, and tripod not included)