metal
it makes your nails grow but it doesn't make it hard
The main substance that makes nails tough and hard is a protein called keratin. Keratin is also found in hair and skin, providing structure and strength to these parts of the body. Proper hydration, diet, and nail care can also contribute to keeping nails healthy and strong.
there is a fluid in your blood that make hormones fizz and makes a hard nail coming from your nails!
nails
This is a simile comparing someone or something to nails. Nails are hard and tough, so this person or thing is being declared to be very hard and tough.
Hard as Nails - 2007 is rated/received certificates of: Australia:M
Buffing just makes nails shiny.
It compares the the nail to how hard it is.
the cat has the most nails. they're tonge has a thing that makes nails
The cast of Hard as Nails - 2007 includes: Justin Fatica as himself
Hard As Nails - 2001 V is rated/received certificates of: USA:R
It makes them shiny.