GD&T Rule #1, also known as the Envelope principle, states that the form of a regular feature of size is controlled by its “limits of size." Limits of size, or otherwise known as size tolerances, can be seen in many forms. A few of them are symmetric, unilateral, and bilateral.
Rules and Concepts of GD&T.pdf
GD&T Tutorial 13A : Rule #1
Geometric Dimensioning and Tolerancing - ppt download
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ASME Y14.5-2009 to 2018 Update Class
GD&T Tutorial 13A : Rule #1
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Solved GD&T Rule #1 is also known as a. The Tolerance