1Excellent Material: 360 prism is accurate inspection of optical glass, and the prism material is carefully polished by K9 excellent glass cutting, which makes the measurement more accurate and durable. 2Anti Wear: The wrapped lens is made of excellent plastic, which makes the prism anti wear and anti drop, and greatly improves the service life of the prism. 3Accurate Measurement: Copper coating or silver coating can enhance the reflection ability of the prism, with full texture, clear and bright. Select the coating color according to the environment, improve the measurement accuracy, and make the measurement easier. 4Easy to Carry: 360 prism is small in size and useful. For added convenience, 360 degree total station prism comes with a storage bag for convenient transport from one job site to another. 5Wide Use: This prism tool has a wide range of uses, applicable to tunnel, subway, mine, highway detection, and applicable to other measuring instruments. Item Type: 360 Prism Material: K9 Glass, ABS Constant: Approx.and23.1mm or 0.91in Effective Diameter: Approx. 25.4mm or 1in Scope of Application: Tunnel, subway, mine, highway detection, applicable to other measuring instruments Uses: Widely used in subway, railway, tunnel, dam, steep slope and other industries 1 x 360 Prism 1 x Storage Bag