Fit model: Professional 5 Star Replacement Finale Super Close Foil and Cutter Bar Assembly Compatible with Wahl(#7043/7031-100) ,Fit for 5-Star Finale Shaver (#8164) (#8061-100) Professional precision: Professional's 5-Star Series Finale Replacement Foil and Cutter Bar Assembly for all-in-one replacement package for Wahl Professional 5-Star Series Finale Shaver (#8164). This shaver cuts razor close for the ultimate finishing job on a variety of cuts; intended for professional use only How to use: Remove the old foil and cutte And clean the hair off the razor ,replace them with our products CUSTOMER ARE OUR PRIORITY: If you can't install it, you can refer to the instructions on the back of the package or contact us in timewe will solve it for you within 24 hours