I bought this case to carry Gowoop's Boost Converter 2PCS XL6009 Boost Converter Module 5-32V to 5-35V DC-DC Output Voltage 400kHz Adjustable Boost PCB High Current 4A for DIY External Power Supply for Panasonic Lumix LX -Camera -ten. The case is qualitatively manufactured, without dents, scratches and deformations. The body is 16-gauge aluminum and the endplates are 18-gauge aluminum. The width of the grooves for mounting the circuit board was 23.26 mm. The internal dimension is approximately square and the width and height are 21.11mm. The product description says an external length of 50mm, however this does not include end plates so you can mount a PCB up to 50mm long.