... special hole pattern comprising stamping, and the aperture to achieve the same thickness, punch diameter (0 ... fromed by stamping; by hole sub: round hole, square hole, diamond hole, elliptical hole, triangle hole. Sturdiness and durability, ... elegant appearance, a wide range of uses.3. SpecificationCold rolled steel sheetThickness:0.2mm-1mmLength:1m-20mHole diameter ...