cooking grate holder for fireplace

This holder is for a 800mm diameter cooking grate (http://www.grillrost.com) and a 1000mm diameter fireplace (http://huch.com/produkte/feuerschalen/).
It's designed to hold the cooking crate securely on different heights over the fireplace. The holder hooks onto the brim of the fireplace.

I decided to cut out everything by a laser cutter. It's made out of V2A steel sheet 3mm thick.