Abstract: A roof panel attachment clip includes a bracket having an upper flange, and a sliding member which supports one or more tabs. The sliding member and the bracket have alignable openings such as slots above a hole for receiving a bolt which connects the bracket to a purlin. The openings are sized to receive the shaft of an installation tool, such as a socket wrench, and must be aligned in order to get the wrench properly on the fastener. The installer is thus assisted in centering the tabs in the slots as he connects the bracket to the purlin. Once the tool is withdrawn, it is possible to slide the tabs out of position, but a biasing force between the sliding member and the bracket resists such movement.