Deluxe 4-way Wiring Upgrade Kit for Fender Telecaster - The 4-way wiring mod allows a fourth wiring configuration where the neck and bridge are wired in series rather than parallel (parallel is the standard Tele wiring scheme). Wiring the pickups in series gives you a fourth option with a fatter sound. All parts in the kit are durable high quality parts sized for USA manufactured Fender's An investment in your tone you'll be able to enjoy for years to come. Note! - Unfortunately, these parts are not compatible with import guitars using metric sizing.