Slotted Hole Perforated Meatl Mesh Perforated Metal Ceiling Tiles Perforated Metal Mesh Product Name Slotted Hole Perforated Meatl Mesh Material Plain steel and aluminum. Surface Treatment Electric galvanized, hot dipped galvanized, PVC coated, and oxidation treatment. Thickness 14 gauge 22 gauge. Hole Pattern Side staggered and straight row. Slot Width 0.125" 0.2". Slot Length 0.1" 0.75". Slot Shape Round end and square end. Slot Side Bar 0.125" 0.25". Slot End Bar 0.125" 0.25".