Roof bonnet, shield-shaped cover plate with guide tools and initials, bollard bar seal ground find lead metal, Roof bonnet shield shaped cover of the nails with embossed some slate tools and attributes such as pump slate roof plate and compass and at the bottom the initials of the plumber probably Delft and on the upper side confirmed archeology Rotterdam City Center Stadsdriehoek Wijnhaven slate archaeological find in the soil Wijnhaven.