D-ring camera screw thunmb screw Sometimes when you want to connect the camera to the cage, you will find it is so many in trouble that you may need a coin or a key to tight because the camera screw in the cage is the simple type that needs extra help. The D-ring camera screw with a split ring you can tighten the screw without using other tools. It can be used for QR plate, camera stabilizer and g...