304 Alloy is non magnetic, corrosion, stain and weather resistant. Staggered perforated hole patterns are offset on 60 degree angles which makes all the bridges the same width and provides maximum strength and uniform wear.304 Stainless Steel Perforated SheetThickness, 0.048 (18 ga.)Width, 8 inchesLength, 12 inchesHole SizeHole Centers, 0.140 Hole, 0.187 CentersTolerances, Thickness, ( 0.005 inch), Width, ( 0 0.063 inch), Length, ( 0 0.063 inch)Notes, Edges may or may not have solid border on one or more sides approx 14 inch. Mill Test Reports are not available for this material, we can provide a Cert of TestConformance.