The Graduated Filter tool to do what they should. No fault in the glass. Screw are accurate. The supplied cover can be screwed together, as all filters and thus obtains a compact cylinder which can be well stowed in the camera bag. However caution when screwing on the camera. I use the filters with a Canon SX50 HS so I therefor need an adapter ring, which is made of plastic. Metal and plastic thread is such a thing. Solve, too, has proved difficult. But a drop of Ballistol Oil and already was no longer an issue. -> Actually, it was less than a drop. It is enough here really a breath.
