Round hole,square hole,slot hole Thickness:0.2 to 20 mm Hole ... , acoustic panels, punch plate, perforated plate, perforated plate, speaker net, punching net , steel net, and other products, and special hole pattern comprising stamping ... and characteristics: fromed by stamping; by hole sub: round hole, square hole, diamond hole, elliptical hole, triangle hole. Sturdiness and durability ...