Description: 【Universal】Designed with a 1/4" head thread, our lubricator is for most general air tool inlet interfaces. This makes it suitable for a wide range of applications. 【Feature】The transparent cover on the outside of our oiler allows you to easily monitor the oil level at any time. This ensures that you can easily maintain and refill the oil as needed. 【Material】The 1/4" Mini In Line Air Tool Oil Lubricator Oiler Compressor Pipe Automatic Lubrication is made of durable zinc alloy material, which ensures its long time to use performance. 【Compact】Our oiler lubricator is small in size and lightweight, making it easy to install and transport. 【Easy to Install】 With a simple screw on design, our mini in line oiler is incredibly easy to operate. Just unscrew the screw to access the oil and add it to your compressor or pipe. Specification: Material: Iron Thread size: 1/4inch (12.5mm) Size Chart: 5.8cmx3.4cm/2.28inchx1.34inch Package Includes: 1 Oiler Lubricator(6 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.