Pro.Fit International DM-45-33 Wire Worm
The Wire Worm is a specialized tool designed to assist routing wires under the dash cavity, under carpeting, above headliners or through the vehicle's firewall. It is 3/8" wide x 48" long and made of nylon that is rigid enough to follow a line, yet flexible enough to turn corners without collapsing. Will not scratch or cut your vehicle's interior or wiring.