Abstract: An anti-theft device for securing personal computers to a table, bench or like top is disclosed. The device employs a strong flat bar affixed to the bottom of the table or bench top, and two units that are threaded to the bar and extend through the table top. These units have bolts that project horizontally into the computer cabinet on opposite sides of the cabinet. One of the two units is an L-shaped bolt one end of which projects into the cabinet and the other end is treaded into the bar. The other unit is a lock assembly having housing with a horizontal bolt. The housing is secured to the bar by a socket cap screw that passes through the top. A key lock unit secures access to the socket of the screw and a cap is welded to the bar to surround and cover the threaded hole and the shank of the cap screw. The projecting bolts are positioned so as to enter the cabinet of the current IBM PC models so as to prevent removal of its slide-out chassis as well as secure its cabinet to the top.