Tweco SGC series ground clamps are tong style clamps. They feature extra heavy duty steel tongs and heavy duty springs that provide maximum contact pressures. This provides excellent current conductivity and allows the clamp to maintain it's grip on the grounded material when other clamps have been pulled loose. This is a 500 amperage maximum steel ground clamp with a copper braided strip connecting the top and bottom tongs for more exacting current conductivity.