Use the 500 ft Boundary Wire to expand beyond the initial 500 ft provided with your in-ground fencing kit. This spool holds 500 ft (150 meters) of 20 gauge, solid core, and burial-grade wire. The length of wire needed will vary due to the amount of twisted wire and layout used. Insure the spliced connection is made waterproof for proper system performance. Using Gel-filled Splice Capsules and wire nuts (RFA-366) when splicing your additional boundary wire is recommended.