The Cullmann Magnesit MX465 Quick-Release System Sliding Unit is a quick-release assembly for any head that needs one, such as Cullmann"s Magnesit series heads. The cast-aluminum assembly hosts a sliding plate and it includes the 2.56"-long Magnesit MX492. The Magnesit MX465 features an Arca-style clamp for broad compatibility with plates from other manufacturers. By sliding the plate forward and back in the clamp, you can achieve optimal balance for your camera. The Magnesit line of plates measure 2.05" (52mm) wide.