FritsJurgens Hinge Systems As Nil Steel Door, we add value to our Pivot doors with FritsJurgens hinge systems. System M It is a self-closing pivot system. It offers adjustable braking and hydraulic reverse control. System M+ Provides control over every part of door movement for light and heavy pivot doors. System One It is FritsJurgen’s most compact pivot hinge with a single pivot point offering a free swing pivot door. System 3 It is a 360 degree rotating pivot system with various holding positions, ideal for turning walls.