EXTRUDED FABRICATED ALUMINUM MATERIAL; 23 INCH BASE WIDTH; 6 FT HEIGHT TO TOP STEP; 6 HEIGHT TO TOP STEP IN FT; 250 LOAD RATING IN LB; 250 LB LOAD RATING; 42 INCH BASE SPREAD; APPLICABLE STANDARD ANSI A14.2, OSHA, UL; RATING TYPE I HEAVY DUTY