DIN571 lag screws wood screws Diameter.: 4MM--20MM (1/4"---1/2") Length: 12MM--500MM. (1/2"~20") Grade: 4.8 5.8 6.8 8.8 Diameter.: 4MM--20MM (1/4"---1/2")Length: 12MM--500MM. (1/2"~20")Grade: 4.8/5.8/6.8/8.8Surface: Zinc Plated, BLACK, PLAIN, YZP, HDGStandard: DIN571Packing: bulk or small box packed in cartons, then in pallets.