Product material Steel For flanges made of carbon steel, gunmetal and brass Zinc-plated Strength class 8.8, EN 20898-2 Bolt 2 washers Nut Valid for system: Geberit Mapress Carbon Steel, Geberit Mapress Copper, Geberit FlowFit M: 10 mm m: 11 mm L: 4.5 cm IK: 3.1 cm