Only opened for inspection. 【Specifically for Alpha 1 II / Alpha 9 III】The SmallRig A1 II/ A 9 III Cage 5187 is designed to provide accessory expansion interfaces and protect the body. It has built-in silicone gaskets for all-around protection to prevent scratches on the camera. 【Easy Installation】Using the HawkLock quick release, it features one-button self-locking, smooth sliding, and improved disassembly and assembly efficiency. The camera is locked at three points through the 1/4''-20 screws on both sides and the M4 positioning posts on the bottom. There is no need to remove the D-ring, and it is stable and does not shift. 【Improved Grip and Support】A wrench design for opening and closing, which fits the body's curves, has been added to the battery compartment position, providing additional support for the little finger, improving grip and control during shooting, and making it more comfortable for long-term use. 【Quick Release Mechanism】Built-in quick release plate for Arca, compatible with Arca tripods, and compatible with DJI RS 2 / RSC 2 / RS 3 / RS 3 Pro / RS 4 / RS 4 Pro stabilizers, allowing for easy switching between handheld, stabilizer, and tripod shooting scenes. 【Excellent Expandability】The cage has built-in 1/4"-20 locating holes, 3/8"-16 ARRI locating holes, HawkLock H21 NATO rail, cold shoe mount, and 1/4"-20 threaded holes. Infinite expansion options are available, including handles 3765 4757, microphones for DJI MIC II, fill light 4055, desktop tripods, and quick release plates for DJI RS Mini.