The aluminum Top Lock Travel Quick Release Adapter from Manfrotto is a quick release system that can either be added to a ball head that does not have a quick release or used to replace an existing quick release with an Arca-type-compatible clamp. This adapter is compatible with the range of Befree tripod kits as well as 490, 494, 496, and 498 ball heads, including the MH490-BH, MH494-BHUS, MH496-BHUS, 494RC2, 496RC2, and 498RC2 models. The compact design of the clamp allows Befree tripod legs to fold inward seamlessly against the clamp without disturbance, and the screw knob locking mechanism firmly keeps the plate in place. Manfrotto recommends that you remove safety stops on the plate that will be in use so it lays flat inside the assembly. The bull's-eye bubble level located to the side of the clamp ensures your horizons are straight.