From Minecraft Parkour Wiki
"Except" represents an intangible zone rather than a tangible one (simpler to describe that listing all bounding boxes)
Block
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Widths (b)
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Height (b)
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Comments
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Model
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Stair (normal)
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Base: 1 × 1
Top: 1 × 0.5
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Base: 0.5
Top: 1
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Orientable, Inversible (8 variants).
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Stair (outer)
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Base: 1 × 1
Top: 0.5 × 0.5
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Base: 0.5
Top: 1
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Orientable, Inversible (8 variants).
Depends on adjacent stair blocks.
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Stair (inner)
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Base: 1 × 1
Except: -0.5 × -0.5
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Base: 1
Except: -0.5
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Orientable, Inversible (8 variants).
Depends on adjacent stair blocks.
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End Portal Frame (eye)
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Base: 1 × 1
Eye: 0.375 × 0.375
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Base: 0.8125
Eye: 1
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The eye looks bigger than it is.
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