Uxcell DIN Rail Mount Carrier for 40mm x 72mm PCB Housing Bracket Black

What is this? DIN Rail Mounting Carrier Housing with Prototype Board for DIN Rail Projects DIY. Are there any advantages of the product? Made of PVC material more durable and fireproof. Easy to install and detach. The profile length is decided as per the required space requirements and without rigid pitch division. Integrated PCB guides and/or PE contact to the DIN rail allow practical device design. How to use it? Steps of installation: 1. Just install the bracket on the guide rail according to the clips slot; 2. Use the screwdriver lightly to both baffles if remove needed. What should I notice? Please allow 1-5mm error due to manual measurement.