Features 【Polished Optical Glass Lens】 This single tilt prism features a carefully polished optical glass lens with a uniform coating, ensuring high-quality light reflection and accurate measurements for surveying tasks. 【Brass Thread Adapter】 Equipped with a 5/8in x 11 brass threaded adapter, this land surveying prism can be easily attached to threaded rods or tripods, making it compatible with trimbles and other surveying instruments. 【 ABS 】 The prism is protected by a wear-resistant ABS , safeguarding the optical glass from damage and extending its lifespan, even in harsh environments like tunnels and mines. 【Wide Range of Applications】 Ideal for tunnel construction, railway alignment, dam inspections, and highway surveys, this prism is a versatile tool for civil engineering and land surveying projects. 【Compact & Lightweight Design】 With a 25.4mm glass diameter and lightweight ABS construction, this railway and dam prism is easy to carry and install, making it for field surveyors working in remote or rugged locations. 1. POLISHED LENS: The optical glass lens is carefully polished, and the uniform and fine coating on the surfaces can ensure quality of lens 2. ADAPTER SIZE: The single prism has a brass threaded adapter that can be attached to any 5/8in x 11 threaded rod or tripod 3. WEAR RESISTANT AND : The prism is equipped with excellent plastic prote ction to ensure that the glass prism part is protected from wear and extend the life 4. SCOPE OF APPLICATION: Single tilt prism can be used in tunnels, subways, mines, highways and other inspection, suitable for measuring instruments such as for trimbles 5. WIDE RANGE OF USES: Land surveying prism is widely used in subways, railway, tunnel, dam, steep slope and other industries Spec: Item Type: Single Tilt Prism Material: ABS Glass Diameter: Approx. 25.4mm / 1in Prism Constant: -17mm Application: Tunnel, subways, mine, highway and other detection, suitable for trimbles and other measuring instruments Application: Widely used in subways, railway, tunnel, dam, steep slope and other industries Package List: 1 x Single Tilt Prism Package List 1 x Single Tilt Prism