Such oil sights glass have the characteristics of good toughness, high strength and wear resistance, and are durable and long in service life. With simple installation, strong sealing and convenient use. Oil sights glass are suitable compatible storage tanks, air compressors, pumps, piping systems, etc. It can observe the liquid level in the container and clearly see the color and transparency of oil and the accumulation of water or other pollutants. It is constructed of aluminum alloy material. There are 5 sizes compatible you to choose from. It is suitable compatible workshops, projects, factories, machinery and so on. Item Name: Oil Sights Glass Material: Aluminum Alloy Features: Good Toughness, High Strength, Durability Size Details: Thread Outer Diameter: 18mm Size: 1.8cm/0.71" (Approx.) 22mm Size: 2.2cm/0.87" (Approx.) 24mm Size: 2.4cm/0.94" (Approx.) 26mm Size: 2.6cm/1.02" (Approx.) 30mm Size: 3cm/1.18" (Approx.) Thread Spacing: 0.15cm/0.06" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Oil Sights Glass