Feature:1. ABS PROTECTION: ABS material wraps the lens, making the prism anti wear and anti drop, greatly improving the service life of the prism.2. K9 GLASS MATERIAL: Optical glass accuracy testing, prism adopts premium K9 glass, carefully polished, more accurate measurement and more durable.3. MAIN USE: This 360 degree prism is mainly used to test tunnels, subways, mines, highways, etc. And the prism is always work with measuring instruments such as for Trimble.4. WIDE APPLICATION: Widely used in various industries such as railway, tunnel, dam, steep slope, etc. This total station prism has a wide range of use.5. EASY CARRYING: This prism is small and compact in size, and comes with a storage bag, easy to carry around for convenient use.Specification:Item Type: 360 PrismMaterial: K9 Glass, ABSConstant: +23.1mmEffective Diameter: Approx. 25.4mm / 1inScope of Application: Detection of tunnels, subways, mines, highways, etc. Suitable for measuring instruments such as for Trimble.Application: Widely used in various industries such as railway, tunnel, dam, steep slope, etc..Package List:1 x 360 Prism1 x Storage Bag