... steel, stainless steel, aluminum, nickel alloy, plastic, brass or copper.ROUND PERFORATIONS: Staggered (60° pattern) is Standard. Variations include 45 ... plates in steel, stainless steel, galvanized steel, aluminium, copper, brass and many other materials. Also available are perforated ... or straight lines. Standard slotted perforations will be round end slots.MARGINS If margins are not specified we ...