EGA multi-directional rolling ladders have four swivel casters which allows precision steering - enabling easier positioning of ladder in tight areas. Double Ezy-Lock mechanism easily lifts ladder to the rolling position. Stepping on the bottom step secures ladder to floor with large 2-1/2" diameter pads on each leg. 50 degree incline safety angle on stair makes ascending/descending more comfortable and with less effort. Tough 1" square tube construction with ergonomic round tube handrails. Weight capacity is 450lbs. Meets OSHA standards