Creates dynamic hull bonding and grounding for increased performance of electronics and lightning protection. Features most proven and reliable grounding plate, sintered porous bronze matrix with approximately 50% porosity, 48 to 1 grounding area for size, best ground path, 34% more grounding than other available plates, streamlined low resistance shape and easy 2-step thru-hull installation. Comes with gold plated terminal mounting bolt and a silver contact coating solution for a positive and permanent connection. 4006 is recommended for lightning protection. 4012 and 4008 are recommended for Loran C or lightning and Loran C. 4018 is recommended for SSB radio, lightning and SSB or lightning, Loran and SSB. Equivalent of copper sheathing is given in minimum column.