For pricechoose optionsSelect Option M10 x 55mm (50) M12 x 75mm (50) M4 x 11mm (50) M4 x 25mm (50) M5 x 15mm (50) M5 x 25mm (50) M6 x 15mm (50) M6 x 25mm (50) M8 x 25mm (50) M8 x 50mm (50) Quantity Add to Basket The MasonMate Rubber Nuts have a brass insert. Can be used in virtually any construction material. Ideal for use in damp and sanitary conditions.