I-beam ground clamps. Connect ground cable to I-Beam or any 1 in. maximum structural steel member-without welding or drilling. Breakaway bolt head shears at predetermined torque to ensure tight connection. Heavy-duty compression lug provides excellent current carrying capabilities. Surface of steel must be cleaned in accordance with installation instruction sheet provided with product. Connector made of high-conductivity cast copper bright dip. Clamp made of drop-forged high-grade steel, zinc-plated.