QCR Rails attach directly to wooden sled runners and provide a foundation for all QCR plastics. Its dovetailed design creates a way for the plastic strips to lock onto the runner and allow quick changes from one set of plastic to another. Two screws are removed and then you slide the plastic off. The rails come pre-drilled and include stainless steel screws for attaching to runners. Standard size is eight feet, these have been cut into four foot sections to allow for easier shipping.