Round hole,square hole,slot hole Thickness:0.2 to 20 mm Hole arrangement straight, staggered we ... hole pattern comprising stamping, and the aperture to achieve the same thickness, punch diameter (0.3 mm -100 mm). Products are of ... stamping; by hole sub: round hole, square hole, diamond hole, elliptical hole, triangle hole. Sturdiness and durability, elegant appearance, a wide ...