12 Tall, 15.75 Long, 12 Wide-Each Half Is 5.75 Tall Wheel Cribs Hold Tires With Diameters From 25 To 30 Inches Special Construction ? Won't Scratch Or Mark Your Floors! Lightweight ? Easy To Carry And Maneuver Works On Virtually Any Surface, Including Sand! Unscootable! Won't Slip Or Slide, No Matter The Surface Wheel Cribs are a safe, lightweight alternative to jack stands. They cradle the tire 12 off the ground, providing unobstructed access underneath the car. Each crib supports 1,500 pounds (3,000 pounds per set) and weighs only 5 pounds. Using 12 Wheel Cribs in conjunction with 56 or 67 Race Ramps allows your car to be level while raised?useful for changing your oil, for example. Wheel Cribs also can be used for car display.