a skewer with a lever on one end that loosens when the lever is flipped. Used for releasing wheels and seat posts.
Levers often found on bicycles which allow seats and wheels to be removed without a spanner. We await the quick-release flat tyre.
A latching device for quickly mounting and removing the camera from the tripod
A clamping mechanism used to hold on wheels and sometimes used to secure seatposts in the frame. Quick releases make it easy to remove wheels for storage or flat-tire repair. You'll also find quick releases on seatposts and sometimes other parts such as handlebars on some folding bicycles.
Skewer used to secure a wheel to a frame with a clasping lever.