Andoer Rapid Connect Adapter Clamp with Quick Release Plate for Manfrotto Tripod Head 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.