Step #1
Draw two rectangles.
Step #2
Draw a L line to make the shape as a prism.
Step #3
Draw a rectangle as shown.
Step #4
Draw a rounded corner shape over the prism.
Step #5
Draw the edges.
Step #6
Draw the hook as shown.
Step #7
Enhance the drawing as shown.
Step #8
Draw six square shapes as shown.
Step #9
Draw six more square shapes.
Step #10
Draw four small circles & two vertical lines.
Step #11
Draw a parallelogram & write numbering from 1 to 12.
Step #12
Make necessary improvements to finish drawing.