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 12 1/8 in Tread Width 36 in End Plate Height 2 1/2 in Number of Bearing Bars 10 Mounting Hole Spacing 7 in Weight 28 lb Shape Bar Stair Tread Load Capacity 400 lb For Use On Metal Stairs For Use Indoors/Outdoors Yes Standards ISO 9001 2015