Review on 49mm to 58mm Step-Up Ring Filter Adapter: Compatible with All Brands of 49mm Lens & 58mm UV, ND, CPL Filters by Dan Phillips

I bought this product thinking it would allow me to use my 77mm ND filter with my 67mm lens, which it did. However, once attached, it will NOT come off. I was able to detach the boost ring from the ND, but the poorly processed thread of the boost ring was completely stuck. I intentionally screwed the boost ring in gently and loosely to avoid this problem, but this product is cancer to whatever you attach it to. It is NOT removable no matter how you remove it and I want to return it now as it is a bad product but I don't even know if I can as it is stuck to another filter and ruined. also filter.