55mm filter adapter for iphone 11 to 13. designed to attach DSLR ND filter to my Iphone 11. Mobile Variable ND filters are much expensive than DSLR also they are very hard to find with good quality whereas DSLR filters are less expensive and you can find them around every corner of your city or town or village or desert. Dimensions are accurate. I used it with K&F concept variable ND filter

N.B. print either in low or medium settings which solves the threading problem, the filter threads perfectly with this settings. if you make it with highest setting then the surface will be too smooth and the fitting will be tight.