... 3 holes sizes 0.5 to 20mm Detailed introduction to Perforated Metal:Material: Stainless steel, aluminum, hot and cold steel ... square hole, round hole, hexagonal hole, scale hole, stretching shaped hole shaped hole punch and other stampings.Uses: Perforated mesh sieve is ... can be used for mechanical equipment, protective cover, ornate speaker mesh cover, food , feed mill screen used mine, mine screening ...