This device is used to secure the computer case from unauthorized opening. It consists of a steel Security Fastener and shoulder washer. It is mounted to the existing screw hole on the back of a computer. The shoulder washer inserts between the computer case and the end of the Security Fastener. It will spin freely if twisted and will not unscrew the case screw. Once attached the padlock is locked onto the fastener denying access to the screw. The computer case lock comes complete with Security Fastener and washer, padlock and a set of screws.