Features Excellent Aluminum Alloy Material --- This total station rotating optical prism is made of excellent aluminum alloy material wrapped around the lens, which is wear resistant and drop resistant. Rotating Protective Cover --- This total station rotating optical prism features a rotating protective cover that can be rotated to easily expose the pentagonal prism and allows front view viewing through the center lens. Handle Design --- This total station rotating optical prism features a handle design with a slot in the handle for mounting a plumb for Bob line center lens for forward looking observation. Wide Application --- This total station rotating light prism is widely used in subway, railroad, tunnel, dam, steep slope and many other industries. Leather Sleeve --- This total station rotating light prism comes with a leather sleeve that can be used to store the prism when not in use to prevent it from being scratched. Specification: Item Type: Total Station Rotating Optical Prism Material: Optical Glass, Aluminum Alloy Application: Tunnel, Subway, Mine, Highway and Other Testing, Applicable to for Leica and Other Measuring Instruments Use: Widely used in subways, railroads, tunnels, dams, steep slopes and many other industries. Package List:1 x Total Station Rotating Optical Prism1 x Leather Sleeve Package List 1 x Total Station Rotating Optical Prism 1 x Leather Sleeve