This adapter makes it possible to convert an already purchased Manfrotto magnesium head to the Top Lock system. The new Top Lock System has been specially developed for professional photographers. It enables quick, easy and, above all, safe attachment, especially for heavy professional equipment. The plate can be attached from above and a safety pin prevents it from slipping. The photo equipment is already securely attached when it snaps into place and an additional fixing screw stabilises the plate. The Top Lock adapter plate is made of lightweight aluminium and has three vials (one for each axis).