EXTRUDED FABRICATED ALUMINUM MATERIAL; 17-1/2 INCH BASE WIDTH; 3 FT HEIGHT TO TOP STEP; 3 HEIGHT TO TOP STEP IN FT; 225 LOAD RATING IN LB; 225 LB LOAD RATING; 23-1/4 INCH BASE SPREAD; APPLICABLE STANDARD ANSI A14.2, OSHA, UL; RATING TYPE II MEDIUM DUTY