Abstract: A cam lock fastening system including cam lock devices for connecting two or more sheet metal panels to create a work booth. The device comprises a rigid, pivotable handle which includes at one end a cam like head; the handle being attached to an angle iron by a pivot pin. The angle iron is placed over the edges of the panels and is in a cooperating relationship with the panels as the handle is pivoted, causing the cam surface to be compressed against the compacted panel. The device is closed completely when a flat portion of the cam surface is in a locking relatonship with the panels. The locking of the device is aided by exerting influence upon the handle in a biasing manner, such as with a mallet like tool. The panels may be disconnected by reversing the direction of the handle to unlock the device. Eight foot sheet metal panels would require about three devices.