This is an enclosure for a 1.3inch OLED diplay eg SSD1306, the dimension are 42x42x42 it has enough space to hold a microcontroller board like the wemos esp32. om the back it has an opening for a USB cable. The front snap fits to the case so you don't need screws. To screw the display to the front you need M2.5x6 screws. I have added 4 washers for the screws.