Really Right Stuff B2-Pro/L Screw-Knob Clamp (80mm)

The B2-Pro/L Screw-Knob Clamp from Really Right Stuff is compatible with most Arca-type camera plates, camera bars, and multi-purpose rails. It features a knurled knob for better grip, so you can apply more clamping pressure onto a plate. Unscrewing the know allows the jaws of the clamp to open wide for plates to be top-loaded quickly and easily.