6.3mm Stud Size 11 mm Hex Size 18mm Flange Zinc Finish Thread Cutting Nuts Compare with: Auveco #12255, G.M. # 11501836, Car Pak # 77-4499, 774499, Disco # 1042PK, 1042B, W&E # 5915, Crest / Midwest # CDR6324, 43533, Winzer # 397.3063, Wurth # 150159355, S&R # 245100