Material: These tile backer board fixing washers are made of galvanized iron, sturdy, durable and easy to use. Installation: Our washer can be firmly fixed to the surface after fixing with the appropriate steel screws. The perforation of the fixing disc allows the adhesive or plaster to stick to the surface of the board, as well as minimizing the risk of delamination or surface damage. Easy to Use: These fixing discs have been specially designed to provide a secure and easy way to facilitate the fixing of backer boards and insulation boards to the floor and walls of the most common materials (wood, concrete, thermal panels and synthetic insulation materials). Application: Used for insulation boards, tile backer boards, gypsum boards, extruded composite boards or simply fixing building boards to frames. Package Content: 100 insulating fixing washers, which is enough for daily use. These insulated fixing discs have a perforated surface, which maintains maximum exposure to the board surface.