"JessEm sets pretty high standards when we develop a new tool. The New Mast-R-Lift II adheres to those strong principles. The Mast-R-Lift II has 5 double sealed bearings, providing a lifetime of use even with the heaviest of routers. All of JessEm's lifts have the patented feature of adding tension to the threaded spindle to remove backlash, vibration, and prevent setting changes while routing. JessEm went one step further with Mast-R-Lift II. A new dedicated locking mechanism for heavy-duty, long-term routing operations was added, accessible from the top of the top surface and is engaged with the same crank handle used to raise and lower the Lift. The Mast-R-Lift II also fits most fixed base routers on the market today without the use of an adaptor collar. The unique clamping blocks on the Mast-R-Lift II enable users to use different fixed base routers with the Lift as opposed to dedicating a router. All our top plates on our Lifts are hard anodized. This process is several times more expensive, but we want the Mast-R-Lift II to provide many years of service. Hard anodizing is an engineered surface treatment and not just a cosmetic sulphuric treatment that will wear off. The shafts on the Mast-R-Lift II, like all JessEm's Lifts are pressed into a shaft mount with hydraulic pressure. We don't just thread our shafts to the top plate. By pressing the shafts into a larger diameter mount we are able to attach the shafts to the top plate and fasten in place with more than just one screw spreading the lateral load and providing a very rigid and durable mount that will withstand the toughest routing operations. The Mast-R-Lift II provides for above-the-table bit changes for all routers without the need for bent wrenches. All the machined components are machined on one of our CNC machining centers in Barrie, Ontario Canada, and all the aluminum non wear components are anodized for appearance, corrosion resistance and some wear resistance. JessEm's new 10 Piece insert ring set. The same design as our four-piece set, including JessEm's standard Tab-Lock design, plus a convenient storage caddy that will hold 14 rings in total. If you currently have our 4-piece insert ring set, they will nicely fit into the caddy as well."