Aluminium Protective Housing Cage Alloy Case Shell Frame for GoPro HD Hero 4 Compatible with Gopro Hero 4 Aluminium alloy material, durable and light Prevents camera from crash caused by overheating There is a 1/4 screw hole in the bottom that compatible with any tripod, and two screw hole on the top which is used to mount your hot shoes It's complete open from the back, so any accessory will fit.