Product description How to maintain performance To maintain perfect shave and 100% performance, it is recommended that the HQ8 blades be replaced every 12 months. Dual Precision HQ8 Replacement Heads Compatible with Philips Norelco Shavers These HQ8 replacement blades are made of selected stainless steel, providing meticulous cut. We comprehensively control and check the production process, details and parameters of each replacement head. Series 7100, 7200, 7300, 7700, 7800, 8800 Series PT/AT700, Series PT/AT800 OEM HQ8 Replacement Heads Compatible with Philips Norelco Shavers Models as Following : HQ7100, HQ7180, HQ7200, HQ7240, HQ7290, HQ7742, HQ7760, HQ7762, HQ7780, HQ7782, HQ8445, HQ8850, HQ8870, HQ8880, HQ8882, HQ8890, HQ8894, HQ7120, HQ7165, HQ7260, HQ7300, HQ7310, HQ7320, HQ7330, HQ7340, HQ7350, HQ7360, HQ7363, HQ7380, HQ7390, HQ7740, HQ7890,HQ8825, HQ8830, HQ8845, HQ8865, HQ8875, HQ8885, HQ8893 AT750, AT751, AT790, AT810, AT811, AT814, AT815, AT830, AT875, AT880, AT890, AT891 PT710, PT715, PT720, PT725, PT730, PT734, PT735, PT860, PT870, 7110X, 7115X, 7120X, 7125X, 7140XL, 7145XL, 7150X, 7180XL, 7183XL, 7240XL, 7250XL, 7260XL, 7310XL, 7315XL, 7325XL, 7340XL, 7345XL, 7350XL, 7360XL, 7380XL, 7735X, 7745X, 7737X, 7775X, 7800XL, 7810XL, 8825XL, 8831XL, 8845XL, 8846XL, 8865XL, 8867XL, 8880XL,8881XL, 8883XL, 8890XL, 8891XL, 8892XL, 8894XL, 8895XL. The blade is made of stainless steel with meticulous cut.The automatic grinding blade head can shave quickly, which is clean and neat. Comfortable shaving, double ring veneer knife net, no skin irritation, more comfortable shaving experience, capture more beard, faster and cleaner shaving. Get a ultimate clean shave everytime with these HQ8 shaving replacement heads. Reset to new every 12 months to keep your electric shaver performing at best performance. Step1: Pressing the button to pull The shaving head holder off. Step2: Remove the retaining ring holder ; then turn it anti-clockwise and lift it off the head. Step3: Remove the retaining ring holder ; then turn it anti-clockwise and lift it off the head. Step4: Reattach the holder. When you close the shaving head properly, you will hear it click into place.