Raise and lower your router without having to remove it from your table with the Incra Mast-R-Lift II Router Adjustment System! This convenient and simple cam router adjustment system lets you quickly make precise 0.001" bit height adjustments from above. Simply use the included lift crank for absolute precision with the naked eye. Features five sealed ball bearings on the lift screw and cam lock, giving you super-smooth operation with the slightest of effort. Includes five steel reducing rings for instant ring changes. And all five are magnetic for a fast, easy, and perfect ring fit.