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Steck 20350 Pro Step$141.99
This Heavy-Duty Platform adjusts from 6-1/2"H to 22-1/2"H with the pull of a few pins. The extra-wide 23" base rails provide added stability. Platform supports up to 500-lb., yet easily rolls around on spring loaded retractable wheels.
The wheels retract when weight is applied, giving you a sturdy, stationary platform to stand or sit on.