Incra MagnaLOCK Router Lifts begin life as either a Jessem Mast-R-Lift II or a Woodpeckers PRL V2 / Sidewinder. These router lifts then receive a top plate manufactured to Incra specifications which includes their unique MagnaLOCK reducing ring system. This system utilzes rare earth magnets to hold the reducing ring securely in place and perfectly flush while requiring no tools to change out.