CSA Approved Grade 1, ANSI Type 1Ao Super tough copolymer top for strength and durabilityo Sizes 2'-10' feature wide 3 slip-resistant serrated aluminum steps for safe climbingo Sizes 12'-16' feature extra wide 3 1/2" slip-resistant serrated aluminum steps for safe climbingo Rugged outside Zinc coated steel spreader armsRencontre ou excède les normes CSA Classe 1A