Tempered, serrated aluminum D-shaped rungs provide for a slip-resistant surface. Impact resistant caps on all rail endsprovide rail protection for longer life and protect work surfaces from marring. Meets or exceeds the safety standards set by ANSI and OSHA. Dimensions: .95" rail depth, 14-1/10" base inside, 13.312" fly inside, 16" base outside and 15.212"fly outside. L-2324-16 does not include rope and pulley.