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I've recently found this grey keyhole-shaped piece - there are a fair number of them that stack together to form a circular staircase. There is what looks like a part number on the bottom but it is unreadable and faint. There is also a number beneath the part number, 201.

(images were made smaller but bigger ones can be added if needed).

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up vote 11 down vote accepted

Bricklink lists it as "Stairs Spiral Step" (Part# 40243). It first appeared in 2001 in the initial series of Harry Potter licensed sets.

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Here is the complete assembly of the staircase: – Philo Feb 29 '12 at 19:40
The second I saw those I thought "Harry Potter for sure." Called it! – Pachow Studios Mar 2 '12 at 2:43
It is also found in the Lego Batcave (set number 7783). – InkBlend Mar 21 '12 at 17:54
Also found in the Hobbit "Barrel Escape" set. In that set though, it's locked in place, so it can't be opened or closed magically like it's supposed to in the Harry Potter sets. – Fikko3107 Sep 11 '13 at 5:27

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