Harness Wiring: This part is a wiring harness, which is a collection of wires, cables, and connectors that are typically organized and bundled together. Wiring harnesses are used to transmit electrical signals and power between various components of a system.

Spool Gun: A spool gun is a type of welding accessory used in MIG (Metal Inert Gas) or GMAW (Gas Metal Arc Welding) processes. It is used to feed welding wire from a spool into the welding torch for precise and controlled wire feeding during welding.

Older M135 Style: This indicates that the wiring harness is designed for use with an older model or style of M135 spool gun. The "M135" likely refers to a specific model or series of spool guns, and the "older style" suggests that this wiring harness is compatible with earlier versions of the M135 spool gun.