Standart : SAE 429/ASME B18.2.1 Hardness : Grade 1 : 70 - 100 HRB Surface Treatment : Plain : Black Oxide : Zinc Plating (Non - Hardened) Strength Class : Grade 1 Brand : ZIMMER, VEEBUS Diameter : 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", 7/8", 1" Length(Inch) : 1/2" - 12"