Large Stainless Steel Washers are great for large and small bird cages. I hate it when you buy a toy or perch and the washers are made from something besides stainless steel. Birds get heavy metal toxicity just like us, but since they are so small it will build up much faster on a bird then a human. Often the washers you get are too small and some only give you one small washer for a bolt? You need 2! I have even seen the wrong size washers on bolts and washers and bolts made from toxic metals.
I decided I would sell my washers since they are all Stainless Steel and they come in 2 sizes 1 1/2″ and the largest washer I have found 2″. If you have a 1 1/2 inch wire spacing put the washer in-between the wires so it connects on the top and bottom or the right and left side. These hold very large birds well.
Used to spread the load of a bolt or screw over a larger area or to help prevent loosening under vibration. Fender washers. Washers with oversized outside diameters. 18-8. A corrosion resistant steel alloy. The most common stainless steel for general hardware use.
https://boltdepot.com/Product-Details?product=2933
