Shenyang yibeite optics co.Ltd. Is a professional manufacturer of precision optical components and optical lens. Since the company was establishedit has been committed to the research and production and sales. We can carry out the optical system design and production of related accessories and nowadays products have been sold to many countries and regions. Our main products are spherical lensescylindrical lensesoptical windowsmirrorsprismsfiltersmetal base mirrors and other high-precision optical components. The base material including a variety of optical glassfused silica and calcium fluoride (caf2)zinc selenide (znse) and germanium (ge)silicon (si)sapphiremetal and other materials. And provide ar coatinghigh reflection filmbeam splittermetal filmall kinds of optical coating. Specifications Material K9 ( schott bk7 ) Dimension tolerance +0.0/-0.1mm Thickness tolerance ±0.1mm Surface accuracy λ/ 4 @ 632.8nm Surface quality 20-10 Parallelism 90% Bevelling