164MM PRISM LENS: This pyramid prism has 64mm glass lens with bright texture, providing high measurement accuracy and work efficiency. 2OPTICAL GLASS LENS: The prism lens is made of optical glass, with fine polishing and a uniform and delicate coating to ensure good durability. 3GOOD PERFORMANCE: With exquisite workmanship, the lens is transparent, uniform, and delicate, with small errors and high qualification rate. 4PRISM SPECIFICATION: This optical glass prism has an aperture of 0.21, an irregular aperture of 0.10.3, and a comprehensive angle of 28 minutes. 5APPLICATION FIELDS: This conical prism is widely used in component surveying, optical catching and drilling, and other precise industries. 1 x Pyramidal Prism