The back portion of the Wave Master TAC-T01-BK Aluminum Case features a standard PSU mount, I/O ATX back plate, expansion slots, and one 80mm exhaust fan mount. An additional PSU back plate is also included to mount a standard ATX PSU. Consumers will be happy to know that the Wave Master TAC-T01-BK handles dual fan PSU's but the secondary fan must removed and remounted from inside the case. Cooler Master has reinforced the tool-less key entry theme by using chrome thumbscrews for connecting all the panels to the case chassis. The top panel is directly riveted to the case frame using a series of rivets that are connected on the left and right hand sides. One single 80mm fan is available as a rear exhaust and Cooler Master has taken the necessary steps to clean up the fan mount. There are no stamped grills impeding airflow instead the fan mount is open and covered by an 80mm chrome wire grill. An ATX I/O back plate is provided which will fit most standard motherboards and includes all the necessary cut outs for serial, parallel, video, USB, mouse, keyboard, onboard LAN and integrated sound.