The Hercules Plus Bi-Folding System is a reliable and versatile solution for interior doors with the option of having 2 or 4 door configurations. Whether you’re updating your home or office, this system offers practicality and elegance. Where the system is top hung there is no requirement for a bottom track. Multiple track lengthsCeiling mounted trackFor wooden and MDF doors Reliable system for interior doors25kg wheels have a ball bearing per axel 40kg wheels have a ball bearing per wheelMaximum individual door weight: 25/40kgDoor thickness 18-40mm (22-40mm for 40kg rating)Tracks can be easily cut down to the required lengthThe system is designed to be used for an even number of doors No need for a bottom track/guide as the system is designed to provide support for up to 40kg per door Configuration:2 doors4 doors2 doors on the left + 2 doors on the rightMaximum single door panel width:  25kg version: 600mm 40kg version: 750mm Contents of complete 2-door set: 3 x hinge1 x set of screws1 x upper wheelset1 x aluminium track 1 x Installation instruction1 x upper pivot with settlement 1 x bottom pivot with settlement Content of complete 4-door set: 9 x hinge1 x set of screws2 x upper wheelset 1 x aluminium track 1 x installation instruction2 x upper pivot with settlement 2 x bottom pivot with settlement Hinge dimensions: 25kg version: 60mm x 18mm 40kg version: 75mm x 23mm Please note: Doors are not included It is not recommended to exceed 600mm individual door width for 25kg It is not recommended to exceed 750mm width for 40kg version for 2 2-door or 2 + 2-door configuration For the 4-door inline configuration, the maximum recommended door width is 450mm 40kg system should be used even for lighter doors