SR 108 begins at an acute intersection with SR 174 (Kings Mountain Road) east of Collinsville and north of Martinsville.

The state highway heads north as a two-lane undivided road through northern Henry County.

SR 108 reaches its northern terminus at its intersection with SR 657 (Old Quarry Road) at Figsboro.

Figsboro Road continues north as SR 890 toward SR 40 at Penhook in southern Franklin County.

[1][2] The entire route is in Henry County.