Small: smooth key ring， can be incorporated into a car key.
Medium: two large bit， a row of four key hooks， a key ring can be folded.
Large: two large bit， a row of six key hook， a key ring， a removable key ring.
【size】
Small: long 9CM * wide 5.3CM * thick 2.3CM
Medium: Length 10.5CM * Width 6.5CM * Thickness 2.5CM
Large: Length 12CM * Width 6.5CM * Thickness 2.6CM