Abstract: A computer chassis in accordance with the present invention is disclosed. The chassis includes a first body, a second body, and an electromagnetic shield coupled between the first body and the second body. The shield includes a plurality of dimples and a plurality of valleys for providing an electromechanical seal when the shield is placed in an interference condition. The chassis shielding system utilizes a shield with a design that is inexpensive to manufacture, is structurally sturdy, and simple to implement in an interference environment. In a preferred embodiment, the shield is provided for inserting between a circuit card mounting bracket and a computer chassis. The improved shield design incorporates special features including a plurality of dimples and a plurality of valleys, strategically located for providing improved adjacent surface contact and enhanced shielding from unwanted radiation.