We have a lot of 9 vintage metal (not sure on the type of metal - they will not stick to a magnet) miniature faux padlocks.  They measure about 5/8" x 3/8" x 3/16" in depth.  They have a small hole across/through the top to use as charms or to sting.  They are solid metal not hollow.  I will ship internationally, please contact me with your country for a shipping quote.