Industrial Pultruded Grating Safe-T-Span(r) Isopthalic Polyester Fire-Retardant Resin (ISOFR) Span 4 ft. 4 ft Width I6015 Surface Grit-Top Yellow Bearing Bar Height 1-1/2 In. Bearing Bar Spacing Center-to-Center 1-1/2 In. Bearing Bar Width 0.60 In. 1-1/2 in Depth None Mesh Pattern Mesh Size None Max Temp 150 Degrees F