For fastening metal to metal, metal to timber. Bolt your structures with Zenith's trade quality bolts.Also known as an Engineer Bolt, used for fastening where there is access to the rear to install a nut. The 304 grade stainless steel provides superior corrosion protection. SS - Hex Head Bolt & Nut. This item is in the category "Home & Garden\Building Materials & DIY\Nails, Screws & Fasteners\Screws & Bolts". The seller is "ozdiam" and is located in this country: AU. This item can be shipped worldwide.