Help you to easily tighten and loosen screws between camera mount and camera, and a O-RING helps to prevent camera from abrasion yet not essential for every buyer, so put it away when you don't need it.
Color: blue screw+ blue wrench, make your camera look cool and awesome. The length of thumbscrew is about 2. 2 inches.
The combination of screw wrench can tighten or loosen the screw easier