PHILIPS REPLACEMENT CUTTING UNIT FOR HAIR CLIPPERS This full metal cutting element is created to give you a fast and clean trim. Use the element without a comb to create a short look of 0.5 mm. Use the trimmer in combination with a comb to achieve other cutting lengths and touch-ups. Works with the following models: HC3400, HC3402 HC3409, HC3410, HC3412, HC3418, HC3420, HC3422, HC3424, HC3426, HC3504, HC3505, HC3507,,HC3508, HC3509,HC3510, HC3517, HC3518,,HC3519, HC3520, HC3530, HC3535, HC3587,,HC3588, HC3589 , HC5410, HC5432, HC5438, HC5440, HC5441, HC5442, HC5446, HC5447, HC5450, HC5460, HC5610, HC5612, HC5613, HC5630, HC5632, HC5650, HC5690 HC7450, HC7452, HC7460, HC7462, HC7650, HC9450, HC9452, HC9490, HC9494.