The Powerbuilt 4" Needle Nose Adapter is perfect for applying thin lines of grease in confined areas. This versatile adapter includes small and large locking sleeves to fit all couplers. With a 4" needle, you'll find it easy to lubricate hard-to-reach engine parts like hydraulic fittings, ball joints and more. The needle is 0.25" in diameter with a 0.046" tip for highly precise grease application.Any automotive specialty tool makes an automotive repair or maintenance task easier, but Powerbuilt takes the concept of ‘help’ a big step further.Every package comes with professionally written usage instructions and photos that take you step by step through proper tool usage.Dependable Powerbuilt specialty tools offer power, precision and style. They meet or exceed applicable ANSI standards and have a lifetime warranty, all at affordable prices.