REINFORCED FIBERGLASS MATERIAL; 21-1/8 INCH BASE WIDTH; 4 FT HEIGHT TO TOP STEP; 4 HEIGHT TO TOP STEP IN FT; 300 LOAD RATING IN LB; 300 LB LOAD RATING; 36-1/8 INCH BASE SPREAD; SAFETY SMART. BRAND; APPLICABLE STANDARD ANSI A14.5, OSHA