Zinc plated steel screws for standard flush-mounted electrical wall boxes (FLEXI+ and others)

We are looking to source screws compatible with standard flush-mounted electrical wall boxes, typically used for securing wall outlets and light switches in residential buildings. These screws often have a fine thread and specific lengths designed to fit into the built-in metal or plastic brackets inside the boxes. Please indicate available dimensions, head types, and compatibility with typical European wall boxes. Used for FLEXI+ WALL BOX and others 32mm long -  Zinc plated. 5000 pcs each.