Supplement X91 Euro Nickel plated, is a clamping base made of high strength steel and nickel as an anticorrosive finish for the X91 series hinges. It is provided with two mounting screws that have a dimension of 14 mm in length and a range of 12mm deep clamping with a 6.3mm diameter.

The screws are located 32mm apart and 37mm from the inner edge of the door.