1[Anti Scratch] The camera cage is made of premium aviation aluminum, accuracy CNC machining, scratch resistant surface. Black anodized treatment, durable. 2[Compatible Models] This SLR camera protective cage is designed for A7M4 A7S4 A7R3 with accurate positioning to ensure a perfect fit for installation. 3[Hollow Design] Camera protective cage is made of all metal, one piece hollow design, can be directly installed and used. Stainless steel connection screws, more stable. 4[With L Plate] With the L plate, you can also easily install or remove the battery. Quickly release it, rotate it and reconnect it to your camera for horizontal or vertical recording. 5[Easy To Use] The camera frame cage provides all around protection, and the camera interface, turntable, buttons and replacement batteries are not affected once the cage is installed.