This command sets the width of the selected polylines. In later versions of AutoCAD, the command PEDIT can also modify the width of multiple polylines.
New width <1.0>: 2
Select Polylines/Contours to change width of:
Select objects: pick polylines
Pulldown Menu Location: Edit > Polyline Utilities >
Edit Polyline
Keyboard Command: cwidth
Prerequisite: A polyline