Durable oil sight glass with high strength, good toughness, and wear resistance for long service life. Features simple installation, strong sealing, and convenient use. Transparent window allows easy observation of fluid levels, oil color, clarity, and detection of water or contaminants. Constructed from aluminum material. Available in 13 styles for a variety of applications. Suitable for use in workshops, factories, machinery, and industrial projects. Item Name: Oil Sight Glass Material: Aluminum Features: Heavy duty, wear-resistant, good toughness Size Details (Diagonal Edge): Style A: 2.12cm / 0.83" (Approx.) Style B: 2.1cm / 0.83" (Approx.) Style C: 2.377cm / 0.94" (Approx.) Style D: 2.621cm / 1.03" (Approx.) Style E: 2.846cm / 1.12" (Approx.) Style F: 3.17cm / 1.25" (Approx.) Style G: 3.19cm / 1.26" (Approx.) Style H: 3.6cm / 1.42" (Approx.) Style I: 2.116cm / 0.83" (Approx.) Style J: 2.628cm / 1.03" (Approx.) Style K: 3.18cm / 1.25" (Approx.) Style L: 4cm / 1.57" (Approx.) Style M: 4.78cm / 1.88" (Approx.) Note: Color may vary slightly due to lighting and screen settings. Slight dimensional variations may occur due to manual measurement. Package Includes: 1 x Oil Sight Glass