The Magnetic Wire Puller From Klein Tools Quickly and Easily Fishes Wire and Cable Behind Finished Walls or Enclosed Spaces. Connect Wire or Cable to The Flexible Stainless-Steel Leader and Rare-Earth Block Magnet That Make Up The In-Wall Unit. Simply Maneuver The Magnetic Hand-Held Unit Over The Outside Of The Wall Allowing The Strong, Rare-Earth Magnets to Provide Great Hold For Easy Wire Pulling or Fishing.