SmallRig Arca-Type Quick Release Plate for SmallRig Cage APU2389 is designed with a hole in the middle which allows unscrewing the camera from the cage without removing the Arca plate from the cage every time, especially for the cage doesn't have an Arca-compatible base. The plate can connect to almost all SmallRig cages via two 1/4” screws on the bottom to prevent twisting and without covering the attachment screw on the cage. It’s compatible with 30 cages from SmallRig, such as the BMPCC 4k cage 2203, the Sony A7III cage 2087 as well as the Nikon Z6/Z7 cage 2243. You can separate your camera from the rig and quickly attach it to a gimbal, tripod, and handheld rig to keep production time down. The bottom features two spring load safety pins to prevent unwanted slipping. And the top of the plate integrates with four rubber pads to protect the cage from scratch. It weighs only 15g and easy for storage.