1、360 DEGREE REFLECTING: The 360 degree prism has 6 separate prisms connected together, allowing the measurement beam to be reflected from any angle. 2、STANDARD TOOL: The prism has a standard offset of +23.1mm and a effective diameter of 25.4mm, with a quick release button for easy connection. 3、METAL HOUSING PROTECTION: Metal housing surrounds the top and bottom of the prism to preserve the glass and prevent the prism rod from flipping over at the top. 4、RELIABLE MATERIAL: This prism tool adopts excellent K9 glass and ABS materials, capable of withstanding construction site environments, ideal for all machines that require measuring rods. 5、WIDE USE: This 360 degree prism is widely used in various industries such as subways, railway, tunnel, dam, steep slope, etc. Item Type: 360 Degree Prism Material: K9 Glass, ABS Constant: +23.1mm Effective Diameter: Approx. 25.4mm/1in Application: Detection of tunnels, subways, mines, highways, etc. Suitable for measuring instruments such as for Trimble. Use: Widely used in various industries such as subways, railway, tunnel, dam, steep slope, etc. 1 x 360 Degree Prism 1 x Storage Bag