5/16" Stud Size 1/2" Hex Size 7/8" Flange Zinc Finish Thread Cutting Nuts Compare with: Auveco #10733, Car Pak # 98-7802, 987802, W&E #928, Barnes / Kar # 34304, Crest / Midwest # CRX1154, Disco # 856PK, 856B, Wurth # 150159300