The Warmup 35mm washers are designed to securely fasten insulated tile backer boards to floors and walls, ensuring a stable and reliable installation. Made from galvanised steel, the washers feature a countersunk screw socket andbond throughholes to allow tile adhesive to pass through, improving adhesion and overall floor or wall integrity. Ideal for use with all insulated tile backer boards, they provide a consistent and professional finish. Suitable for all Insulated Tile Backer Boards Countersunk Screw Socket for Secure FixingBond ThroughHoles Allow Tile Adhesive Penetration Galvanised Steel Construction Suitable for all Insulated Tile Backer Boards Countersunk Screw Socket for Secure FixingBond ThroughHoles Allow Tile Adhesive Penetration Galvanised Steel Construction