Extend either the length or width of your TrueTrac Gantry System by adding these two 55" Rail Extrusions. The TrueTrac Router Gantry System allows you to use your standard 2-1/4 to 3-1/2 HP router with a 1"- to 2"-diameter spoilboard router bit, to easily flatten large slabs. This extension kit also includes self-aligning Dovetail Connectors and assembly hardware. Features: Specifications: What’s Included: