Tutorial - Modeling Gland in SolidWorks?

Here is the tutorial.
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Step 1:
Top plane>>sketch.
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Step 2:
Draw this profile.
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Step 3:
Extrude it by 15mm.
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Step 4:
Top face>>sketch.
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Step 5:
Draw a circle of 40mm dia.
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Step 6:
Extrude it by 30mm.
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Step 7:
Top face>>sketch.
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Step 8:
Draw a circle of 28mm dia.
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Step 9:
Draw two circles of 16mm concentric to the edges.
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Step 10:
Extude cut >> Through All.
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Step 11:
And we have the Gland.