Tutorial - Modeling Ring collar nut in SolidWorks?

Here is the tutorial.
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Step 1:
Start SolidWorks in Part mode. Top plane>>Sketch.
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Step 2:
Draw a polygon with one side of 25mm.
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Step 3:
Extrude it by 20mm.
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Step 4:
Top face>>Sketch.
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Step 5:
Draw a circle tangent to the side of the polygon.
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Step 6:
Extrude cut by 45º draft and check flip side to cut.
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Step 7:
Bottom face>>Sketch.
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Step 8:
Draw a circle of 36mm dia.
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Step 9:
Extrude it by 6mm.
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Step 10:
Face>>Sketch.
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Step 11:
A circle with offset of 3mm.
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Step 12:
Extrude it by 6mm.
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Step 13:
Bottom face>>Sketch.
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Step 14:
Convert the edge.
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Step 15:
Extrude by 6mm.
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Step 16:
Top face>>Sketch.
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Step 17:
Draw a circle of 25mm dia.
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Step 18:
Extrude cut through all.
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Step 19:
Chamfer.
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Step 20:
Upper and lower edges.
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Step 21:
And we have the part.