These T-Slot Roll-In Nuts for the Nebo Roof Rack and Wasatch Rear Cargo Rack increases the ease and convenience of mounting accessories to an assembled rack. Instead of having to uninstall a slat to slide the nut in from the end of a 10-Series T-Slot simply roll the Roll-In Nut into place and back out to remove. Spend just five seconds rather than five minutes installing a nut.