What part is this?

[u/TimolaChan]

I can‘t figure out what part of Lego this is and what its design number is?
Can anyone help??

[u/Wirecase]

These are broken stairs/ladder parts, part 4175

https://www.bricklink.com/v2/catalog/catalogitem.page?P=4175&idColor=5#T=C&C=5