... Hole : Long hole, square hole, round hole, hexago Punching Sheet High precision, small error and good quality, punch diameterHole : Long ... round hole, hexago hole, scale hole, stretching hole etc.Puching Sheet Wire mesh Use stainless steel, aluminum, hot and cold steel ... that can be used in the building ceiling, wall of sound-absorbing material that can be used for building stairs, balconies, ...