Concealed Minddle Hinge 6180(9mm)/6180-1(13mm)

Used in the casement window; 

To increase the sealing performance;

Material: Zinc alloy sash part, plastic frame part;

Surface Treatment: Zinc alloy part is with zinc Plating;

Window Axis: 9mm or 13mm optional; 

Life Time: 25 000 times;

Salt Spray Testing: 240+ hours without red rusting.