These hex bolt and nut sets are ideal for fastening metal to metal and metal to timber. They are commonly used for securing the two objects where there is access to the backside to install a nut. They are used in a wide range of industrial applications. They are driven by a wrench. Grade 316 stainless steel hex bolts and nuts withstand rust, allowing the fasteners to be used in coastal areas. High tensile steel hex bolts and nuts enhance strength and toughness to reduce the chance of breaking.