Mar-resistant impact caps on all rail ends provide rail protection for longer life and protect work surfaces from marring. D-shaped rungs. Fixed runglock. Slip-resistant feet. Dimensions: Side Rails 2.5 in wide; .75 in Rail Flange; 1.23 in Rung; Base outside width 16 in ; Fly outside width 16 in Meets or exceeds the safety standards set by ANSI and OSHA.