HQ4 Plus. Fits Norelco Micro Action Plus, Micro Action, Double Action, Lift and Cut, Rotatract models only. Does not fit any other Norelco razor models. Contains 3 cutters and 3 combs. Micro Action Plus Replacement Heads Fits Norelco Micro Action Plus, Micro Action, Double Action, Lift and Cut and Rotatract Razor models only. Micro Action Plus Models: 5812XL/5625X/5426LC, 4885/4865/4861/4853/4852/4845/4825/4821/4817/4816/4807/4606/4606/4605/4604/4603/4602/4601X, 4417/4414/4413/4406/4404/4403/4402/4401LC. Double Action Models: 985/968/965/955/950/945/935/915/905/900/895/885/875/850/835/825/805/800RX, 750/725/720/715/710/705/700RL. Tripleheader Models: HP 1608/06/05/04/02/01, 1337C, 1328, 1328E, 1328S, 1327, 1327D, 1323, 1319, 1318. Also fits Norelco Doubleheader Razor Models: 665/605/600RX, 505/501/500RL, 486/484/482XL, 410DB, 400DX, 300SX, 200SC. Not all razor model numbers may be listed. Does not fit any other Norelco models.