Jotto '03-'11 Escape / '01-'11  Mazda Tribute and '01-'11 Mercury Mariner - 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.