Manfrotto 324 5/8-Inch Survey Adapter for TripodsThis survey adaptor is made of two pieces: a 5 8 bushing with a 3 8 female attachment to connect it to a tripod and a removable plate 124mm diameter with a 5 8 male thread that should stay connected to the equipment. With the 324 it is possible to transform any Manfrotto tripod into a tripod compatible with the standard attachment interface system used in the survey and measuring industry. Attachment (bottom): 3 8" female thread; attachment (top): 5