Fastlok is a fast and convenient way of creating an in-line splice that is very close to the full strength of the wire itself. You simply push your wire or cable into the ends, leaving at least a two-inch tail which will allow for easy adjustment or re-tensioning. 

Once in position, serrated rollers grip the wire as any reverse tension is applied. To increase wire tension, simply pull the wire through even more. To remove the Fastlok, cut the wire, pull the loose ends through, and you are ready to use the Fastlock again. 

It is reusable, able to be retightened, and works well for ends and brace wires as well as regular splices. This one size fits only 12.5 gauge wire.