property FormatGridLinesOptions.Width as Long
Specifies the line's width or size (1 by default)

TypeDescription
Long A long expression that defines the size of the line
By default, the Width property is 1(1-pixel wide). The Width property specifies the line's width or size. The Color property specifies the line's color. The Style property defines the style of the line. The Step property defines the step to show the grid lines. The Skip property specifies the number of grid lines to skip