Steel stabilizers are attached to the underside of a table top, counter to the direction of the wood. They minimize wood warping, washboarding, cupping and gapping over time as the moisture in the wood changes. Stabilizer bar fits into a recessed groove created by a custom milling cutter. Part 988HW will support milling the recessed grove using a CNC machine. Part 989HW will support milling the recessed grove using a router. Utilizing the router bit (989HW) will require two passes to fully mill the recessed grove and a jig (not supplied) is recommended. The Stabilizer Bar has elongated screw hole grooves that allow the table top to freely "swim" the length of the opening as the moisture content of the wood changes. Choose lengths from 11 12/16 to 72 inches.