In this tutorial, you will create this part.
1.Click New. 
Click Part,
OK.
2.Click Front Plane 
and click on Sketch.
3.Click Rectangle, 
sketch rectangular. Click Smart Dimension, 
dimension rectangular 3in x 3in.
4.Click Feature>Extruded Boss/Base, 
set D1 to 1.0in and OK. 
5. Click on front face and select Normal to.
6. Click Hole Wizard, 
for Hole Type select Counterbore, Standard ANSI Inch, Type Socket Head Cap Screw and Size #10.
Click Positions tab,
click 4 points at edges,
click Smart Dimension and dimension all 4 points 0.3in from edge.
Click OK.
7.You’re done!
