The BT8310-LK is a Locking Kit that allows the user to disable the pop-in / pop-out function of the BT8310 and BT8310XL. Its spring-based design allows the screen to be released when simultaneously pulling the hook and pushing the mount. Ideal for avoiding accidental pop out of screens, and enabling secure, quick and easy access when using the pop-in, pop-out systems with the BT8310 and BT8310XL mounts.