Sturdy Roller Tracks 100 D4 hold the Axles of roller elements in place. They are available separately so that users can design their own customised roller conveyors.
The following combinations are possible:
Roller Track 100 D4-20/33 (0.0.649.60): D30 roller elements (all colours)
Roller Track 100 D4-20/33 ESD (0.0.662.24): ESD D30 roller elements (0.0.620.41)
Roller Track 100 D4-50 (0.0.650.48): D30 roller elements with flanged wheel (all colours)
Roller Track 100 D4-50 ESD (0.0.662.25): ESD D30 roller elements with flanged wheel (0.0.648.97)