hi Put you in touch myself, I am the President of the Board of Directors of the Egyptian Society for pet birds We use aluminum rings in various sizes for installation of bird legs to get to know it And honored that you are dealing in the manufacture rings We use various sizes rings 1 - inner internal size 2.7 mm 2 - inner diameter of 3.2 mm 3 - inner diameter of 4 mm 4 - inner diameter of 4.4 mm and The raw material of aluminum-resistant and oxidation bright Drilling show the possibility of certain paint workshops Raw material to be drilled by the percussion I have a group of photos to learn more on what needed to contact us by massenger or mail ***** Show More