This DC Laptop Power jack is a 2.5mm center pin power jack. Here's a few of the laptops that this Jack is used with:
 

ASUS - W1000 (W1), M2400N, M3000N, M6N, Z7100

AVERATEC - 2100, 2200, 3200, 5110, 6200, 7100 Series:2100, 2200, 3150, 3200, 3220, 3250, 3260, 3300 (E1200),                                     5110, 5110H, 6200, 6210, 6220, 6240, 7100, 7170

CLEVO -  Model 98

COMPAQ PRESARIO -  3000, 3000US, 3005, 3005US, 3008, 3008CL, 3015, 3015CA, 3015US, 3016US, 3017, 3017CL, 3017US, 3019, 3019CL, 3020, 3020US, 3045, 3045US, 3050, 3050US, 3070, 3070US, 3077, 3077WM, 3080, 3080US

HP Omnibook - XT1500
HP Pavilion:- XZ168, XZ148, XZ275, XZ295, XZ355
HP Pavilion - ZT series: ZT1000, ZT1100, ZT1125, ZT1130, ZT1135, ZT1145, ZT1155, ZT1170, ZT1175, ZT1180, ZT1185, ZT1190, ZT1192, ZT1195,  ZT1200, ZT1230, ZT1235, ZT1250, ZT1260, ZT1290

HYPERDATA - 3000 (M3000N)

IBM Thinkpad:- I Series

JETTA -  Jetta jetBook 9220

MATRIX -  TPR Series 110 (NOTE: will need to verify pin size before ordering, as can come in several pin sizes)

MITAC -  P8080, M722  (NOTE: will need to verify pin size before ordering, as can come in several pin sizes)

Packard Bell - iGO6204

Sager - Model 98, NP4881-v Model M4A

Sharp - pc-cl1-5ca

TOSHIBA SATELLITE - 1000,1000-S157,  1005, 3000 & 3005 Series, 1200

TWINHEAD -  E14B

VPR Matrix -  200A5, 200A