Soss Invisible hinge model #216 is for use in wood or metal applications that are 1-3/8 to 1-3/4 in thick. The model #216 hinge is made of zinc and steel materials. This full-size door style hinge will provide superior appearance and durability. Our hinges are found in many applications where flush fit, compact size and smooth operation are necessary features. Soss Invisible hinges open a full 180 deg and are single-action hinges.