Aokbean Vintage Skeleton Key in Antique Copper Style - Set of 30pcs (Copper)

In comparison to a true skeleton key, what is the size of these? I want to be sure they aren't small, charm size. Thanks!

Can I get a pack with just one style? I am doing a special project where all the keys need to be the same.

Are these Stainless Steel

Are these lead free?