Motor Grounding Ring Compatible Motor Frame 280M (4 6 or 8-Pole) 280S 355L (2-Pole) 355M For Motor Frame Type IEC For Nominal Shaft Diameter 75 mm Material Aluminum Ring Construction One Piece Ring Outside Diameter 109 57/64 mm System of Measurement Metric Features Designed to Help Extend Motor Life by Safely Diverting Harmful VFD