LEATHERCRAFT SNAP HOOKS
Snap hooks in brass and stainless steel for dog leads, shoulder straps and detachable handles.

Trigger or spring gate?
Trigger hook: opens by sliding the trigger with your thumb; the most secure for dog leads.
Spring gate: clips on by pushing the gate, easy to use one-handed; for bags and shoulder straps.

The size is the inside width of the eye, where the strap passes through.