No tools or drilling required. No marks and does not affect the appearance of cabinets. Maximum distance that can be covered between handles or knobs is up to 5 inches. Long adjustable U shaped lock for mushroom shaped knobs and D shaped handles. Helps keep toddlers curious about cabinets. 4 pack chest of drawers for multiple cabinet doors. Dimensions: Approx. 18 * 5 * 1 cm / 7 * 2 * 0.4 inch (L * W * H).