﻿## 0
During solid editing, a parameter is defined instead of a constant value. The diameter value 12 is offered as a default value of a new parameter.

You can use parameters instead of constant values whenever you define or edit solid dimensions, distances in geometrical constraints or dimensions or distances within 2D profiles creation solids. Then, solid shape or location can be easily changed by redefinition of values of parameters.
## 9
Another new parameter is defined.
## 10
Both holes will contain the changes. Diameter and chamfer values are changed from constant numeric values to parametric ones. In the next step of this example, the width of grooves is also changed to parametric value.
