AlyasameenStep-Up Ring Adapter Converts The Thread Size Of The Lens To The Thread Size Of (67mm - 77mm)

Unfortunately, 49-67 and 58-67 are incompatible with my Canon RF lense (Ф 67mm) 24-105mm for mirrorless cameras.But the 2nd side of the step-up ring 49-67 is matching with my DSLR Canon EF lens (Ф 49mm) 50mm 1:1.8 STM.Also, I don't know why but Step-up ring 58-67 is also incompatible with my K&F filter CPL+ND (58mm).Though it's easy to use, easy to remove. Looks like good quality metal. I've already requested for refund.P.S.: I've already found out the reason! There's a detailed description under some other brand that the 1st number is for the lense always! and the 2nd number for the filters and other accessories! So, in my case I need step-DOWN ring 67-58 mm.

Not bad quality. My only gripe is the struggle to unscrew it. If accidently tightened too much. I almost had to leave two rings as is to avoid damage to the lens and filter. Wish it had a little knob or hole for allen key plug in. Good otherwise