The ArcaSmart360 is a rotating adapter plate that fits Arca-Swiss style and Manfrotto RC2 style heads. With the ArcaSmart360, you can easily go between Arca-Swiss style heads to Manfrotto RC2 style heads. The plate has two sides: a 45-degree side for the Arca-Swiss style and a 25-degree side for the Manfrotto RC2 style. Simply rotate the plate to choose which side of the plate you need. The scale allows you to indicate your position or start/end point. There are no tools required for attaching to your camera. The plate includes a D-Ring Camera Screw with hex and coin slot.