Features： 1、Prism Appearance: This prism is a measuring prism with a protective housing, a basic round prism reflector and holder, and a prism with regulable brass connectors. 2、Light Weight: Our small prism is lightweight and very easy to carry on your pocket, allowing you to access it at any moment. 3、ABS and K9 Materials: Our prism is made of ABS and K9 materials with craftsmanship and can withstand certain harsh environments for long term use. 4、Usage Security: We enhances the security of prism in usage, can withstand greater work strength, improves performance, allows for an enhanced experience in usage. 5、Use Model: The prism is suitable for Leica total station, constant with 17.5mm offset, high accuracy, so you can have a nice using experience. Specification： Item Type: Mini Prism Material: ABS, K9 Round Prism: Approx. 25.4mm/1in  Prism Constant: +17.5mm when applied for Leica total station (Prism constant is not 17.5mm when applied for other instruments.) Package List： 1 x Mini Prism 1 x Storage Bag