These self-locking catches are easily installed into any cabinet, drawer or cupboard within the house. Internal locks cannot be seen from the outside of a drawer and help to prevent your child from accessing potential harmful substances. Remember to always keep any dangerous substances high up in an area totally inaccessible to children. As children often learn how to open such devices by watching and imitating their parents, having a variety of catches and latches throughout the home can increase the deterrence effect of these products.