For Fixing The Outer Layer Of Thermal Insulation Materials To Timber Osb Boards Or Sheet Metal Substrates With An Appropriate Screw. Large Surface Area - Increased Surface Area For Improved Hold Of Softer Materials. Impact Resistant - Made From Rigid Polypropylene (Pp) For A High Strength And Reliable Fixing. Versatile - Can Be Surface Or Recess Fitted When Used With 67Mm Cutter And Styrofoam Discs. And Compatible With The Installation Fixing Washer (Tdw110). Masking Plug - Eliminates Thermal Bridging And Ensures An Aesthetic Finish.PTDTIMTAD60