Features DURABLE CONSTRUCTION: This mini prism system with side bubbles is an all-metal prism assembly with fluorescent orange and fluorescent yellow powder targets Clear & Accurate Precise Optical Glass Detection Enhances the Prism's reflection ability, full of texture, clear and bright, measurement more accurate and durable. RESISTANT PRISM: This 25.4mm diameter fog-resistant copper prism also features an angled bracket with friction shaft, offset by 0mm or -30mm SCOPE OF APPLICATION: The mini prism reflector can be used for tunnel, metro, mine, highway detection, suitable for Leica COMPLETE ACCESSORIES: Prism system kit with U-frame, adapter, S-hook, lid for easy installation and use, and bag for easy storage and transportation Specification: Item Type: Mini Prism System Material: optical glass and aluminum alloy Constant: 0mm/-30mm Effective diameter: approx. 25.4 mm/1 inch Application: Tunnel, Metro, Mine, Highway Detection, Suitable for Leica Package list: 1 x Mini Prism 1 x U-shaped box 1 x Adapter 1 x S Hook 1 x lid. 1 x storage bag Package List 1 x Mini Prism 1 x U Shaped Box 1 x Adapter 1 x S Hook 1 x Lid 1 x Storage Bag