High-Grip Perforated Stainless Steel Washers for Insulation& Backer Boards (100)

Stainless Steel/Galvanized Perforated Insulation Washers for Tile Backer Boards 35mm (ZL-6713). Superior Adhesive Keying: Unlike solid washers, theperforated 6-hole design allows tile adhesive or plaster to pass through the disc.