From Calder
A complete set of the four items - lead dome, stainless steel screw, brass cup and nylon washer which not only saves time; it creates a weatherproof fixing to your lead sheet. Ideal for use with intermediate cladding, stone and masonry. 20 x Lead domes 20 x Brass Cup Washers 20 x Brass Screws 20 x Nylite Washers