Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1224 / 1490

The feature control frame is placed at the specified location.
Sym
Displays the geometric characteristic symbol, which you select from the Symbol
Dialog Box. The dialog box is displayed when you select one of the Sym boxes.
Tolerance 1
Creates the first tolerance value in the feature control frame. The tolerance
value indicates the amount by which the geometric characteristic can deviate
from a perfect form. You can insert a diameter symbol before the tolerance
value and a material condition symbol after it.
First Box
Inserts a diameter symbol in front of the tolerance value. Click the box to
insert the diameter symbol.
First Box
Creates the datum reference value. Enter a value in the box.
Second Box
Creates the tolerance value. Enter a value in the box.
Second Box
Displays the Material Condition Dialog Box, in which you select a modifying
symbol. These symbols act as modifiers to the datum reference.
Select the symbol you want to use. The dialog box closes. The symbol is
inserted into the MC box for the primary datum reference in the Geometric
Tolerance dialog box.
Third Box
Displays the Material Condition Dialog Box, in which you select a modifying
symbol. These symbols act as modifiers to the geometric characteristic and
the tolerance value of features that can vary in size.
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