The 15" QPD-380 Plate from Feisol is milled from a solid block of 6061-T6 aluminum that has a dovetail on the bottom of the plate that mounts to most clamps or ball heads that are Arca-type compatible. The adjustable double male 1/4"-20 mounts slide side-to-side to accommodate the size of two cameras or other accessories while attached at the same time. Furthermore, the rubberized surface prevents mounted accessories from moving once they are locked down.