Brass Plated Steel Key Rings 1.25″ or 32 mm in diameter.  Handy devices that allow you to lose ALL of your keys at one time, our brass plated steel key rings require no batteries nor training. Ready to use right out of the box.  These are about 1.25″ in outside diameter, 1″ inside diameter.  Pack of 10 for $6.00, USA shipping included. RNG-114