Guide Rail Limit Stop, Provides Secure, Positive Stop For Starting Or Ending A Cut, Fits Seamlessly To The Back Of TS Plunge Cut Saw's Sole Plate, Helping Reduce The Risk Of Kickbacks For Plunge Cut Starts, Fits Quickly & Securely To Top Of The FS Guide Rail For Both Cutting & Routing Applications, THIS ITEM IS ONLY AVAILABLE TO FESTOOL DEALERS.