How do we read the Configurations in Solidworks CAD 2019 for the bore (Library Feature)?

I have attached a screenshot. In the Feature Manager, I'm unable to understand what is 2 and what is 1 under 'Configurations'.

bore with square keyway bs 4500p1 - Also, what does 'keyway', 'square' and 'bs 2500p1' mean?

Any help would be appreciated. Thank you!

Accepted answer

2 is the key slot width, 1 is the key slot height, diameter is the bore diameter.

Keyway is an engineering term meaning the slot which a key engages.

Square is a shape. In this case, the shape of the keyway.

bs 4500p1 is probably a "british standard" specification defining fits of something or another.

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