The concealed cabinet hinges are made of cold rolled steel material and finished with nickel plating to ensure a longer life.And fixed with thickened rivets,no matter how many times it is opened and closed,it will not fall off and is durable These soft close cabinet hinges are made with built-in dampers that help doors close more safely and quietly to protect hands and fingers,and extends the lifetime of the doors cabinets.Range for door thickness:14-25mm Widely used for overlay/half overlay/full Inset cabinet doors. Anyone can do the installation with a screwdriver, easy and no drilling required our concealed hinge was mounted inside cabinet door and frame,you can't see it when the door closs,which makes your furniture more aesthetically pleasing.Suitable for most cabinets, shoe cabinets, bookcases, wine cabinets, closets, cupboards, drawers. But not for big heavy doors 4pcs 90 degree hinges and screws. If you are not satisfied with our products, please feel free to contact us.