The MRS-24 Magnetic Retrieval System is the ideal tool to effortlessly fish wires through walls. The kit includes 24" flexible magnetic retriever MRS-BC10 10' ball chain with 3/4" stop ring MRS-RH20 expandable retriever hook Storage pouch To fish a wall using the MRS-24; Drill a hole in your wall or top plate, then drop the eye loop end of the ball chain down the wall. The chain will collect at the bottom of the wall. Locate your wall fish location and take the baseboard off the wall, scoring the wall with a knife first so you do not peel the paint and do not break the baseboard. Drill a hole so you can fish the ball chain out using the MRS-24. Make sure the MRS-24 is shaped like a "Z" or "S" so you can go back and forth to find your ball chain. Once you find the ball chain, carefully bring the ball chain to the hole. The chain will not completely come out of the hole. Use the expandable retriever hook and pull the chain out of the hole. Tie a pull string on the end of the ball chain eyelet. The other end of the pull string is connected to a wire to be fished in the wall. This helps in case you need to pull the cable through rough spots in the wall cavity so you do not break your ball chain.