Bare Ground Clamp, Pipe Diameter 2-1/2 to 4", 10 - 2 AWG, Bronze Clamp With Steel ScrewBare Ground Clamp, Pipe Diameter 2 1 2 to 4 Inch, 10 2 AWG, Bronze Clamp With Steel Screw The quality of Penn Union's products and services lies in our ISO 9001: 2015 registration. The registration ensures that the documentation and implementation of our Quality Management System is in compliance with the international quality standards as specified by the International Standards Organization in Geneva, Switzerland. The standards cover every aspect of