The KidCo Metro Gateway provides safety to your pet and home but doesn't damage your doorway or walls. And it does it with fresh styling. The stainless steel look is at home in modern decors and kitchens. Constructed of aluminium over a steel frame, it is both strong and light. To ensure that it is mounted properly, it utilizes upper and lower pressure indicators - red means it's not secure, yellow means installation is acceptable and black means it is secure.