Designed to fit Philips Norelco shaver series 6000 (s6xxx). Blades capture hair in fewer passes for a smooth shave 72 self-sharpening skin protect blades leaving your face smooth and comfortable. Open the shaver by pulling off the top half of the shaving unit. Remove the blue ring holding the blades by turning the lock counterclockwise. Remove the old shaving heads and carefully insert new SH60 heads. Replace the blue rings and turn each one clockwise to lock. Re-attach the shaving head bracket. Replace your blades every 12 months for best shaving performance. Fits the following models: S6000 series, S6880/81, S6810/82, S6850/85.