ITEM NAME:2pcs T20 7440 W3X16D W21W Female Socket Wiring Harness Backup Turn Signal Light 2pcs T20 7440 W3X16D W21W Female Socket Wiring Harness for DRL Backup Turn Signal Light SPECIFICATIONS.(Suitable for: 7440 W3X16D W21W Turn Signal Light. 4) Pre-Wired socket for Easy Plug and Play Installation. 3) Only be used for front or rear turn signal lights only. 1) Made of quality nylon material, durable and high heat resistance.