A1011 Carbon Steel Bar Stair Tread, Material Carbon Steel, Material Grade A1011, Bearing Bar Spacing 1 3/16 in, Bearing Bar Height 1 1/4 in, Bearing Bar Thickness 3/16 in, Nosing Surface Diamond Plate, Top Surface Smooth, Tread Depth 9 3/4 in, Tread Width 36 in, End Plate Height 2 1/2 in, Number of Bearing Bars 9, Mounting Hole Spacing 7 in, Weight 23 lb, Shape Bar Stair Tread, Load Capacity 400 lb, For Use On Metal Stairs, For Use Indoors/Outdoors Yes, Standards ISO 9001:2015