How to Make a Screw Driver in AutoCAD | 3D Design | Step by Step

Q. Model the screwdrever shown below. Use the dimensions provided but not dimension the model. Render the model, red handle with chrome shaft.
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What was the purpose of puttin the perpendicular circle in the shaft and then moving the entire shaft into the handle? Why couldn't you just extrude a smaller amount for the shaft in the first place?