EXTRUDED FABRICATED ALUMINUM MATERIAL; 20-1/2 INCH BASE WIDTH; 5 FT HEIGHT TO TOP STEP; 5 HEIGHT TO TOP STEP IN FT; 225 LOAD RATING IN LB; 225 LB LOAD RATING; 35-1/2 INCH BASE SPREAD; APPLICABLE STANDARD ANSI A14.2, OSHA, UL; RATING TYPE II MEDIUM DUTY