These ground clamps are used to ground copper or aluminum wires to water pipes, ground rods, rebar or other structural members that will ensure positive grounding to the earth. These clamps may be used on pipe sizes 1/2 in to 1 in and are made to accommodate bare or armored ground cable. Garvin Industries' unique labor saving design allows the upper portion of clamps to slide open easily and, attach to ground members without needing to remove the screws. The rotational movement of the clamps allows a quick removal if necessary. Their cast bronze construction assures ground path continuity and provides excellent corrosion protection in damp locations. They work on both solid and stranded ground wire. Their threaded 1/2 in hub provides a connection point when grounding wires must be run in conduits. The two screw hub meets all codes including NYC and Chicago.