The aluminium adapter is very light and appears to be made of really cheap alloy, also the edges are very badly chamfered so theres a lot of really sharp swarf points that can cut you... but nothing that some sandpaper can deal with. The filters are very good for their price tag, there are some inperfections on the mounting holes but the materials are "automotive" quality and the manufacturing is decent just dont expect "race" materials!
Exactly as described very happy.