'08 Ford Taurus/Mercury & 05-07 Ford 500 & Freestyle Base Only is 3/16" guage steel, black, round stck. Mounts to existing seat bolts of passenger seat. No need to pre-drill holes. Purchase base only and mount in your other vehicle to easily move the desk between the two. If you find yourself in a new car or truck, purchase only this base and re-use the rest of your JottoDesk.