Deter children from opening doors or getting locked in a room with a door knob cover. Compatible with standard spherical doorknobs. Jool Baby Door Knob Safety Cover features a subdued, unobtrusive design that blends into your room design. EXCLUSIVE LIFETIME MONEY BACK-GUARANTEE: If at any given point you’re not 100% satisfied, we’ll offer you a prompt and full refund of our child safety door knob covers!