INCRA Mast-R-Lift-II Router Lift Exclusive INCRA MagnaLOCK reducing ring system (3/8-Inch, 1-Inch, 1-5/8-Inch, 2-5/8-Inch, 3-5/8-Inch) for instant ring changes and perfect ring fit Change router bits from the top of the table. Quickly make super precise, 0.001-Inch height adjustments from above 9-1/4-Inch x 11-3/4-Inch x 3/8-Inch plate size is compatible with all INCRA Router Tables and fits some other brands Exclusive ball bearing mechanism for super smooth action and low friction Patented thread tensioning system eliminates vertical lash in the lift mechanism. Ultra-responsive, direct drive 16TPI lift screw mechanism