1、[K9 Glass] This 360 degree mini prism adopts K9 glass, ensuring high measurement accuracy and durability. 2、[Good Protection] Plastic casing surrounds the top and bottom of the prism to preserve the glass, to prevent the prism pole turns over at the top. 3、[Sturdy Construction] This mini prism is built to withstand worksite conditions, ideal for all machine jobs, ensuring long lasting performance. 4、[Complete Accessories] Comes with 4 surveying poles, 1 round bubble, 1 hook joint for more convenient measurement. 5、[Wide Usage] This total station prism is versatile for Topcon, for Sokkia, for Trimble total stations, can be widely used in subways, railways, etc. Item Type: 360 Degree Prism Material: K9 Glass, Aluminum Alloy, Plastic Model: Mini GRZ101 Constant: +23.1mm Effective Diameter: Approx. 25.4mm/1in Application: Testing of tunnels, subways, mines, highways, etc. Use: Widely used in various industries such as subways, railways, tunnels, dams, steep slopes, etc. 1 x 360 Degree Prism 4 x Surveying Pole 1 x Adapter 1 x Spring Hook 1 x Storage Bag