USS HX CP GR.5 5/16X3 *Brand Name: HILLMAN *Head Diameter: 5/16 in. *Length: 3 in. *Finish: Heat Treated Zinc *Material: Steel *Product Type: Hex Head Cap Screw *Number in Package: 100 pk *Grade: 5 Grade *Thread Type: Coarse *Packaging Type: Boxed *Unit of Measurement: Metric