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Input value for D2, H3, L1 respectively under Details View tab.
D2 =  0.5 in
H3 = 3.3465 in
L1 = 1.299 in
 
Note: Your dimension naming might not be the same as the one shown here. It is fine. Just make sure your value correspond to correct dimensions.
 
Next, we need to make sure that the sketch is symmetry symmetric on both side. Under Sketching Toolboxes, select Constraints tab. Select Midpoint and constraint constrain the geometry in the Graphics window as shown below.
 

 
Next, we will make sure that the both circular hole is of same dimension. Under Constraints tab, select Equal Radius. Execute constraint in the Graphics window as shown below.

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