You are buying the 3d model and the 2d layout, so it will be ready to cut. The product is in the form of a digital download.
Mounting brackets will need to be designed for your application.
This download is in standard measurement (you will need to scale for metric).
Image 2 shows inside widths (this can be changed for your application)
Recommended Material Type: 3/16" - 1/4" Plate Steel
Disclaimer: This file was designed for one application, and some adjustments might be requited to fit your project.