I just needed a bunch of stainless shim washers at a set size, either buy from ebay for 10x the price or aliexpress for straight from the same manufacturer considering 99% of ebay items are dropshipped and also get a lot more to future proof my needs - plan to use them for future 3d printed items as I often default to 6mm for hardware so perfect for when I need small consistent gaps and they make good smooth surfaces for like a compact thrust bearing. It amazing what you can use a simple shim washer for outside it's original purpose.Not wanting to sound too alarmist, but given you're manufacturing a safety device, are you at all concerned about the material traceability of the parts you're using?
I trust it will be provided with the disclaimer that it's ornamental and not to be used for climbing.