original c. 1950's vintage american industrial machine shop portable two-step tubular steel low-lying stepladder fabricated by the i.d. cotterman co., chicago, il. the fully functional lockstep raised the casters to the lock the ladder securely to the floor. retains the original "factory green" powder coat enameled finish. the perforated treads provide maximum traction. the hardened black rubber swivel casters are original and intact. surface wear (i.e., paint loss) consistent with age. measures 20 x 20 x 20 inches.