EXTRUDED FABRICATED ALUMINUM MATERIAL; 19 INCH BASE WIDTH; 4 FT HEIGHT TO TOP STEP; 4 HEIGHT TO TOP STEP IN FT; 225 LOAD RATING IN LB; 225 LB LOAD RATING; 29-1/2 INCH BASE SPREAD; APPLICABLE STANDARD ANSI A14.2, OSHA, UL; RATING TYPE II MEDIUM DUTY