These Aluminum Standoffs are used for mounting additional mounting plates to the Center Plates on the Next Level 500mm and 650mm Multi-Rotor Frames. This standoff is the same size used in the Next Level kits for mounting the Flight Controller Boards, and are 3/16" in diameter and 3/8" long with 4-40 threaded holes on each end. These parts are packaged 12 pieces per bag.