Sinsun Fastener can Produce and spply :

Umbrella head is designed for preventing the roofing sheets from tearing off around the head of the nail, as well as offering an artistic and decorative effect. The twist shanks and sharp points can hold wood and roofing tiles in position without slipping. 

Roofing nails, as the name implies, are intended for the installation of roofing materials. These nails, with smooth or twisted shanks and umbrella heads, are the most commonly used type of nails because they are less expensive and have better properties. The umbrella head is intended to prevent roofing sheets from tearing off around the head of the nail while also providing an artistic and decorative effect. The twist shanks and sharp points can keep wood and roofing tiles from slipping. To ensure the nails' resistance to extreme weather and corrosion, we use Q195, Q235 carbon steel, 304/316 stainless steel, copper, or aluminum as the material. Rubber or plastic washers are also available to prevent water leakage.