Stairville Quick Link 4mm Typ 3SV, Chain Link, Black galvanized quick connector DIN 56926 - B - 90, Material - Ø d: 4 mm, Form B, Opening: approx. 11.5 mm, Breaking strength: Min. 900 daN, With stamped classification: DIN 56926 - B - 90, Quick chain link NG 4 mm