Spring Concealed Hinge 1, Size:25x118mm 2, Material: Zinc Alloy 3, Finish: SC, ... Copper, Antique Brass.4,Weight bearing: 50 KGS/PC5,Open degree:1806,Suitable for Wooden door, swing door.7,Door thickness ... .2M8,With spring inside, can be self-closing. Spring Concealed Hinge, Self closing hinge,SOSS cross hinge,invisible hinge with spring