Sunwayfoto DPG-39 Universal Quick-Release Plate
Description (from B&H): The Sunwayfoto DPG-39 Universal Quick-Release Plate is made from solid aluminum and is compatible with Arca-Swiss mounts. The convex edge design helps prevent any shifting and there are two safety-stop mounting holes on the back of the plate (screws are available separately). This is an excellent QR plate for smaller film and DSLR cameras, including the Olympus OM20, Nikon D80 and D90, Canon 550D, 600D, etc. The plate is 1.77″ (45mm) long and 1.53″ (39mm) wide. The groove length is 0.69″ (17.5mm).