[Clear color : the clear door knob safety cover for kids can prevent children from opening doors into restricted areas and its clear design is suitable for installation on knobs of various colors. Compatible with more door knobs : the clear childproof door knob cover are 2.7 inches long and 2.3 inches wide. The large size will fit more standard spherical door knobs. "Material friendly : the door knob cover material is safe non-toxic tasteless and pollution-free and the smooth surface can protect childrens hands. Perfect for families with children to use." Install and remove : simply align the two covers of the child door knob covers with the knob and close them to complete the installation. Use a screwdriver can remove the door knob covers. "Easy for adults to open the door : the clear child safety door knob cover has two openings on the side. Easy for adults to grip and open the door But its hard for kids." Tip : In order to prevent the clear baby door knob safety cover from working properly please measure the size of your door knob in advance.]