The matte box can be easily attached to the front of a lens using the various adapter rings. Two slots for 4" x 5.65" filters are included. This allows you to combine an ND filter with a Black Mist filter, for example. The respective adapter rings also have a filter thread, so that a 67mm filter could also be attached to the 67mm adapter ring. It is relatively easy to use. In some parts the matte box could feel a little more high-quality. The fact that it is made primarily of plastic is, however, at least beneficial in terms of its low weight. There are threads on the bottom, back and top, which can be used to attach the matte box or to connect additional accessories. There is also a hot shoe on the top, although the top flag tends to get in the way. I like how compact and light the matte box is; it functions well. I don't like how big the storage and carrying bag is. It's a large hard case and has a very generous cutout for the adapter rings, making it taller than if the bag had been designed just for the matte box. I find the shape a bit unwieldy, but otherwise, it's nice that one is included at all, so I'm not deducting any points for it. Overall, I'm very satisfied with the K&F Concept Matte Box. It's a good alternative to existing brands in this category.