Features: 0.8 (20mm) of sliding travel within plate to optimally balance gear. Female 3/8-16 1/4-20 threads on bottom. Plate has 1/4-20 3/8-16 mounting screws, in addition to anti-twist video register pin. 2-Stage Safety Quick Release System. ** This item is not manufactured by Manfrotto. It is 3rd party manufacture to compatible with Manfrotto.