36mm Steel Insulation Washers and Screws for Insulation Fixings Including Tile Backer Boards XPS Insulation Thermopanel Marmox Wedi and More Packs of The 100 (25mm Screws x100 and 36mm Washers x100) :
Tile Backer Board Metal Washers, Wet Room Tile Backer Fixing Washers - 100 Pack - The Underfloor Heating Site
Tilebacker Boards Fixing Washer & Screw 35 x 25mm - 1000 Units - EMFC-05-0025