Access otherwise out-of-reach areas in libraries, classrooms and more with the Stop-Step Ladders. Ladders are constructed of all-welded aluminum with non-skid vinyl treads on each step to prevent slipping. These ladders also feature weight-activated retractable casters to keep step ladders stationary when in use. Step ladders are available in two, three or four step styles. The four step style ladder also features a hand rail for added stability. The hand rail is available on the right or left hand side; please specify when ordering. Ships UPS.