Cramer Taskit 50011PK-82 Scooter Stool Rolling Step Stool, Grey High-density plastic stool rolls easily in place. Spring mounted with retractable casters, a protective bumper and stackable design. Non-slip treads and lock-in-place wheels keep you safe. Super lightweight and easy to lift. High-density plastic construction Non-slip tread for safety Retractable casters 15.5" diameter Holds up to 300 lbs