These tiny hold down toggle clamps are fantastic...
I use these by the bucket load. I use them for my small table saw sled, drill press, & even my miter saw stop block jig.
This particular flavor is the small variety. Great holding power for small pieces and best suited for delicate work - small bench-top drill presses, holding things down for repetitive measuring, etc.
The base is attached to your jig or tool via some mounting screws or bolts (Sorry, not included). I tapped some threads into my drill press and used some machine screws to make it permanent.
Use your imagination and you'll discover 100's of handy uses for these clamps!