Got this to cover Schwalbe marathon winter tires, studded 35mm with no problem. Installation was easy to figure out but it took some time to adjust around to clear the tires. Nuts and bolts that came with the fenders did not fit my bike's front eyelets so I used some spare parts from home. They fit fine on rear eyelets.
The fenders kept my feet wet through a heavily-snowed urban city last winter. I once kicked the fender as my bike had a bit of toe overlap, and instead of being jammed to the wheel, a safety tab broke off instead, working as designed.