Classic Keylock Screw-Lock

Good all-arond biner. Tougher at times to loosen spinner. Comes in hany as a keychain or other small "MacGyver" style projects. Would not suggest using it for last mentioned project.

Small, inexpensive locker. I use mine for my daisychain anchor. Its small size makes it awkward to use for many situations, but as someone mentioned below it's great when you need to lock it and forget it.

Super affordable and light weight. Awkward shape, and low gate clearance makes them clumsy to work with. But, well suited for the applications where you lock it once and leave it for the rest of the pitch (e.g. daisy to ascender) or need a locker 'cause dropping item 'X' would be a very bad thing.