Hex tap bolts are fully threaded machine bolts, designed to adhere facing materials to prevent shear movement; specifically for use in wood to wood, wood to metal, or metal to metal applications. Zinc, grade 2 hex bolts are recommended for most general uses and are corrosion resistant for typical use. Be sure to pre-drill any holes and to use washers and nuts that are a similar grade and finish. *; ; Brand Name: Hillman Head Diameter: 1/2 in. Length: 3-1/2 in. Finish: Zinc Plated Material: Steel Product Type: Hex Tap Bolt Number in Package: 25 pk Grade: 2 Grade Thread Type: Fully Threaded Packaging Type: Boxed Unit of Measurement: Metric