Snap Caps snap over Snap Studs. They are assembled through the fabric, and then permanently "pressed" together using a special hand punch tool.
Use to snap one piece of canvas to another, such as removable panels in a dodger, or a "door" in a cockpit cover.

Nickel-plated brass
Use long barrel cap for thicker material, or several layers of material
Standard snap-on and snap-off design - snaps on and off in any direction
Install using SDL 299120-1 hand punch tool
Sold in sets of 6