Description: 【Threaded Design for Hands Free Use】Self Tightening Oil Funnel, simply screw this funnel into your engine’s oil fill port (replacing the cap) for secure, spill free pouring, no need to hold it in place. Note: Fits ports larger than 2.9cm/1.14inch; not fit for threaded caps 【Size Information】Car Oil Funnel measures approx 26.5cmx12.5cm/10.43inchx4.92inch, small and portable, so you can use it at any time 【Visual Design】The funnel features a clear viewing window, allowing clear observation of oil flow for timely fluid level manage to prevent overfilling or underfilling 【Self Locking Mechanism】The unique self locking design secures the funnel firmly in the oil filler port during refueling, prevent slippage or tilting 【Self Tightening Function】The funnel base utilizes an expansion sleeve design that creates a tight seal with various sized oil ports Package Includes: 1 Engine Oil Filling Funnel Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.