For Norelco and Philips Models: Sensotec, Spectra, Quadra, Reflex Action, Reflex Plus, Advantage, and Cool Skin Shavers. For use with Philips/Norelco head types: HQ5, HQ55, HQ56, HQ6, HQ8, HQ167, HQ177 Extends the performance life of your blades ... great alternatives to throwing your dull blades away Sharpens your blades in just 3 to 5 seconds. What could be quicker? Reusable ... sharpens your blades over and over again. Simple to use ... makes sharpening as easy as cleaning your shaving heads