... brands of laptop. Such as Dell, Hp, Toshiba, Samsung, Acer, IBM, Sony, Lenovo, Fujitsu, Compaq, Delta, Gateway, Liteon, Apple and so on ... 15V6.3*3.0mmToshiba etc.M2DC 16V5.5*2.5mmIBM,Lenovo etc.M3DC 16V6.5*4.4mmSony,Fujitsu etc.M4DC 18 ... .0mmDell etc.M10DC 20V3holesDell etc.M11DC 20V7.9*5.4mmIBM,Lenovo etc.M12DC 18.5V7.4*5.0mmHP,Compaq etc.