This mounting bracket is for this Ledvance LED High Bay. It's an alternative high-bay mounting option for situations where the included mounting hook is unsuitable. Popular use cases include warehouses, halls, and indoor sports venues where the high bays may be knocked when in position.
For details on measurements and installation, see the additional images above. Mounting hardware is included to bolt the bracket to the high bay, but you will need to supply your own hardware to fix the bracket into position at your site.