Killark MC6 - 360° armor grounding spring is reusable. Copper free aluminum construction for harsh, corrosive and certain hazardous locations. Provides sealing back nut plus inner o-ring seal to prevent moisture ingress to the cable armor and enclosure. Robust threads and world class seal enables easy installation with minimal torque required MC aluminum cable connector series is designed for use with jacketed interlocked, continuously corrugated and welded armor cable. This series is for use where it is essential to provide positive grounding to the cable and for a type 3, 4 connections