Metal door locks (ST15 Stone)

This is what AI said.

These are a set of five vintage mechanical locks, likely salvaged from mid-century cabinetry or furniture rather than exterior doors. Each one combines a small deadbolt mechanism with an integrated ball-shaped knob, plus a strike plate for mounting.

A few notable characteristics:

Construction: Heavy cast iron or steel bodies with black Bakelite-style spherical knobs. They were originally painted white or light grey enamel, but the finish is now heavily distressed, with peeling paint exposing rust beneath.
Mechanism: Square-tumbler keyways (an older key standard) and a horizontally-protruding deadbolt that extends past the housing. Most also have a small toggle or lever near the knob, probably functioning as a secondary latch or quick-release.
Condition: Fair to poor overall — corrosion around the keyways and moving parts, one detached mounting plate, and a couple of loose knobs. That said, none appear broken beyond repair; with cleaning and lubrication they'd likely still work.
Security level: These were built for keeping cabinet or interior doors shut and deterring casual opening, not for genuine intrusion resistance. They're light-duty household hardware.