Hole callouts are available in drawings. If you change a hole dimension in the model, the callout updates automatically.
Hole callouts use Hole Wizard information when a hole has been created by the Hole Wizard. The default formats for the Hole Wizard types are stored in installation directory\lang\<language>\calloutformat.txt. A second file, calloutformat_2.txt, is a simplified version. You can edit either file. If you want to use the second file, you must rename the file to calloutformat.txt, which is the file name the SolidWorks software references. You can set the location of the default folder for Hole Callout Format File in Tools, Options, System Options, File Locations.
The number of instances is included in the hole callout if a hole in a linear or circular pattern was created in the Hole Wizard.
The axis of the hole must be normal to the
drawing sheet.
To add hole callouts in a drawing:
Click Hole Callout 
on the Annotation toolbar, or click Insert, Annotations,
Hole Callout.
The pointer changes to 
.
Click the edge of a hole, then click in the graphics area to place the hole callout.
A Hole Callout is inserted
and the Dimension
PropertyManager appears. The callout contains a diameter symbol
and the dimension of the hole diameter. If the depth
of the hole is known, the callout also contains a depth symbol 
and the dimension of the depth. If the hole is created in
the Hole Wizard, the callout contains
additional information (the dimensions of a countersink or number of hole
instances, for example).
Edit the callout in the Dimension PropertyManager.
You can specify precision, select an arrow style, or add text. However, you should retain the dimensions and symbols for the size and type of hole.
If the hole has been created by the Hole Wizard, you can also click Variables in the Dimension PropertyManager to access a list of Callout Variables to insert into the hole callout.
If you attach a hole callout to a tapped
hole in ANSI inch standard and the current drawing units are millimeters,
the drill diameter and hole depths are reported in mm but the thread description
retains the ANSI inch size designation. You might want to replace the
thread description with other variables from the Callout
Variables dialog box.
Repeat steps 2 through 4 to insert additional
hole callouts, then click OK 
.
To edit the properties of a hole callout:
Select the callout and make the changes in the Dimension PropertyManager.
If you manually change a portion of the
callout text, you might break that portion's link with the model. SolidWorks
displays a warning message if you are about to break a link.
To modify hole callouts to include tolerances:
Select a hole callout.
In the
PropertyManager, select a Tolerance
Type 
.
Type a
value for Maximum Variation 
and Minimum Variation
as necessary.
Click OK .
To toggle between Hole Wizard and geometry definitions:
Right-click the hole callout and select Display Options, Define by Geometry.
To return to the Hole Wizard definition, right-click the hole callout and select Display Options, Define by Hole Wizard.
These menu items are available only when
holes have been created using the Hole Wizard.