The Dimensions of the Part:
Basic Steps to be followed for creating this model:
Use circles to define three corners of the profile.
Use lines tangent to the circles to define the sides of the profile.
Create the angled line on the upper left side of the profile.
Construct the upper right corner of the profile.
Trim appropriate curves.
Create a circle (that will define a hole in the extruded solid).
Extrude the profile.
Create additional curves.
Edit the extruded profile.