Tutorial - Modeling Ring nut in SolidWorks?

Here is the tutorial.
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Step 1:
Top plane>>Sketch.
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Step 2:
Draw two circles of 18mm and 10mm dia.
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Step 3:
Extrude it by 5mm.
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Step 4:
Top face>>Sketch.
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Step 5:
Draw a circle of 15mm dia.
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Step 6:
Extrude cut by 1mm. Check the flip side to cut.
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Step 7:
Bottom face>>Sketch.
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Step 8:
Same circle with 15mm dia.
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Step 9:
Same Extrude cut operation of 1mm flip side to cut.
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Step 10:
Chamfer.
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Step 11:
Select the inner edges.
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Step 12:
Top face>>Sketch.
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Step 13:
Draw this entity.
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Step 14:
Extrude cut through all.
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Step 15:
Reference Geometry>>Axis.
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Step 16:
Select the circular face.
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Step 17:
Circular pattern.
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Step 18:
Uncheck the geometry pattern and about axis1 pattern the cut-extrude3 6 times.
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Step 19:
We have the part.