These covers are sheared to size with ⅛” thick 3003 Tread-Brite, have a grab handle with T-lock assemblies in stainless steel or aluminum, (4) gas springs that reduce lift-weight and dampen closure, and a sub-assembly fabricated of 6061 aluminum with a (96” X 96”) opening. Certified welders complete all welds. Bolts and fasteners are stainless steel. One-year warranty on all parts.