Do these pliers work on all snap ring sizes?

These handle standard internal and external snap rings found in most automotive applications — transmissions, differentials, clutches. If you're working with metric or specialty retaining rings, test-fit first to confirm jaw clearance.

Can I use just one plier, or do I really need the pair?

You can get by with one, but you'll spend time swapping tools on a job. The pair keeps you efficient — internal plier on one hand, external on the other, especially useful during transmission or differential work where you're pulling multiple ring types.

What's the best way to keep these from damaging snap rings during removal?

Keep the tips clean and aligned — any bent or worn jaw will dig into the ring. Angle the plier gently into the grooves first, then apply steady pressure rather than sudden force. A light touch with these tools prevents deformation better than raw strength.