Ergonomic design positions you properly to help reduce back, neck and leg strain and prevent fatigue. Independently adjustable height and angle help you maximize proper body alignment and comfort. Exclusive 3M™ Safety-Walk™ Surface and extra-wide 22 in. (56 cm) platform add stability and slip resistance. Angle adjusts up to 30 degrees; height adjusts from 4 to 4.75 in. (10 to 12 cm).