DIN316 318 Wing screws,
Material: Steel
a) Malleable cast iron GT: GTS or GTW at the discretion of the manufacturer;
b) Forging or cold working at the discretion of the manufacturer;
c) Copper-zinc alloy CuZn: wrought alloy or cast alloy at the discretion of the manufacturer;
d) Austenitic stainless steel A: grade is determined by the manufacturer