Heavy duty and high grade EPDM washer with A2 stainless steel cap to provide a water-tight seal. Also known as a BAZ washer. Frequently used with self-drilling screws in roofing applications. High quality gradeUp to 180C temperature range"To Fit Screw Dia. mm - N/ATo Fit Screw Gauge imp. - N/AOuter Dia. mm - 25.0Colour - N/AMaterial - Austenitic Stainless Steel (A2-304)Finish - N/A Timco BAZ Washers - Stainless Steel (Size 25mm - 100 Pieces) in Black Size: 1000mm x 1000mm