Premium Strength: Manufactured from Grade 8 hardened steel for superior durability and high-torque applications Course Threaded: Designed with a course thread for a more secure attachment between pieces. Compatible with standard nuts and washers. Hex Cap Construction: These large bolts feature a hex cap that allows for greater torque application than circular caps Large Hex Bolts: The greater diameter of these steel hex bolts allows for stronger, more heavy-duty load bearing across the join Versatile Use: Ideal for automotive, industrial, and heavy machinery projects requiring maximum fastening security. The corrosion-resistant zinc finish protects against corrosion for long-lasting performance indoors and outdoors. Diameter: 5/16" Length: 1/2 inch Material: Steel Finish: Yellow Zinc Head Style: Hex (1/2 Wrench)