Heavy-duty steel construction gives long life and the ability to move heavy loads. Each platform is covered with a tough foam rubber pad and measures 6" x 8-3/4". Each unit can be adjusted from 23" closed to 37-1/2" fully extended. The adjustment locks in place with a 4-arm threaded knob screw. Each unit includes eight full swivel double ball bearing casters with 2" non-marking soft rubber wheels.
 
Load capacity is 1,600 lbs. per set. Sold two per set and weighs 26 lbs.