The Catch Cover safety cover keeps kids- phones- keys and pets where they belong...Out of the ice hole! It simply rests in the Catch Cover ring and prevents things from falling into the open ice hole. The vented design maintains airflow so the hole does not get skim ice on it. It also has a slot that runs to the center of the screen for fishing with a rattle reel or bobber rig. That slot also works great for suspending transducer and underwater camera cables. The Catch Cover safety cover can be used with or without hole sleeves.