I'm calling on the combined experience of ETS to help me with a problem. I'm looking for a locking carabiner to use as a keychain. Ideally it should be between about 2.5" to 3" long (some flexibility in my spec). As I shop around I see that the ones for climbing almost never list the dimensions, which is problematic for someone looking for one for EDC use.

Cost isn't a big concern since I only need one of them. But it has to be good quality. All the cheapo, small ones I've seen are pretty flimsy and have one fatal flaw- the locking nut is too loose and tends to back down or go past the end of the arm.

Anyone have a suggestion for one that will stay locked and that's the right size for keys, a small light and pocket knife?