Material: stainless steel Fire door hinges have always been very popular for their functionality, durability and long lasting design. Fits standard internal residential doors. Ball bearing hinges have always been highly regarded for their smooth operation. Fits standard internal residential doors, one pair of hinges is adequate These small mini hinges can be used for delicate boxes, model making, small cabinet drawers in dollhouses, wooden jewelry boxes and other small items. Suitable for household and commercial applications, mounting for house door or cabinet door, window, cabinet, toolbox, etc. Color: Black Material: stainless steel Surface treatment: brushed steel Note: During the installation process, the hinge shafts of the same door must be on the same vertical line to prevent doors and windows from bouncing