The pliers on this little guy are quite substantial for a small tool. They aren't that much smaller than the Leatherman Juice series, and are pretty close to the Wenger New Ranger or Buck XTract size, which is amazing considering how compact the M3 really is.
They are a bit smaller than the XTract pliers (how did I know you'd be the first person to respond to a post in which I referred to the XTract? ) but closer than most other keychain pliers.Mine has never come loose off my keys, and as you can see from the marks on it, it was carried fairly extensively. I suppose I could see how it could fail, but I can only comment on my experiences since no one else seems to talk much about these.Def