Jotto '00-'11 Tahoe/Suburban/CK1500/2500/3500 Pickup/Yukon/Avalanche/'04-'08Hummer H2/'02-'10 Escalade 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.