Corrosion-resistance + linear motion you can count on. Sold separately yet compatible with both 115RC kits (4180-0756-XE/4180-0746-XE), this 47" aluminum track acts as the solid foundation for a lightweight, reliable movement solution. For further customization, aluminum tracks may be cut to a desired length or butted together to extend length of travel. Note: these aluminum tracks do not come with pre-drilled holes.