The M-Plate Mini is a universal camera tripod plate with the world's first integrated tripod mount to work with most Manfrotto RC2 and Arca-Swiss connections, and modular attachment points for accessories. Durable and sturdy, yet lightweight, the M-Plate Mini provides a stable and a secure connection between camera and tripod head, making for smooth and easy transition to Arca-Swiss and Manfrotto RC2 heads. Weighs 1.3 oz. Made in USA.
The M-Plate: One Camera Tripod Plate to Rule Them All-Michael Zhang, PetaPixel
The M-Plate Is One Smart Tripod Plate.-Udi, DIYPhotography.net