Item Type: Corner Cube Prism_x000D_ Material: Optical Glass_x000D_ Aperture: 0.2-1_x000D_ Irregular Aperture: 0.1-0.3_x000D_ Clarity: 60 40_x000D_ Total Angle: 2-8sec_x000D_ Diameter: Approx. 25.4mm/1in 1[High Precise] This corner cube prism with the diameter of 1 inch (25.4mm) provides precise measurement and efficient performance, ideal for various applications. 2[Optical Glass] Crafted with optical glass, this prism undergoes meticulous polishing to achieve a bright and glossy finish, enhancing the overall aesthetic appeal. 3[Protective Coating] The prism features a uniform and smoothly surface coating that not only adds a layer of protection to the glass, but also ensures long lasting durability. 4[Standard Size] Strictly manufactured, this corner cube prism has high standardization, with precise size and shape, can seamlessly fit various instruments. 5[Long Lasting] Designed to withstand wear and tear, this trihedral retroreflector is built to last, providing enduring performance even in demanding environments.1 x Corner Cube Prism