They feature a fully threaded fastener style required for when the shaft of the fastener is being inserted completely into a threaded hole.APPLICATIONS: The hex bolt is primarily used for heavy duty industrial functions, but also used for a wide assortment of t-track jig building, repair, anchoring and woodworking projectsHIGH QUALITY: Each hardware component features a precision machined, solid carbon steel construction for long lasting durability with rust and corrosion resistant zinc plated protection