Constructed of rugged-yet lightweight-PVC material. Raceways run flush with one another for increased density and a neater appearance. Included Raceway Cover's latch design fits "fingers" snugly Screws into walls and other surfaces to provide organized cable management The innovative "fingered" design of the Slotted Wiring Duct Cable Raceway System creates wiring slots that securely hold wire and cable.Simply detach as many "fingers" as you need to change the routing scheme as your system grows. Finger edges are rounded to prevent cable abrasion.