Do the lug nut spacer rings work with my wheel studs?

Spacer rings are sized for common stud patterns, but you'll need to test-fit them on your vehicle first. Ring diameter and stud hole spacing vary — verify fit before committing to installation.

How much tension should I set on the roller?

Start light and increase gradually as you roll. Too much pressure creases; too little doesn't move metal. Feel develops fast — one or two practice panels tells you what your sheet thickness needs.

Can I use this roller on plastic or fiberglass panels?

This tool is designed for metal work. Test on scrap material first if you're unsure — plastic and composite panels can deform under roller pressure differently than steel.