Hydraulic Buffering Clip-On Concealed Hinge 35mm Diameter Cup With Spring,Auto-colsing Materiel:Steel Hydraulic Buffering Clip-On Concealed Hinge35mm Diameter CupWith Spring,Auto-colsing Materiel:Steel Finish: SNP Opening angle :110o Depth of hinge cap: 11.3mm Diameter of hinge cap: 35mm Door thickness: 14mm~22mm 4 screw holes base standard With Screws. Hydraulic Buffering Concealed Hinge