1,Material: optical glass, 2,Plano-concave lens;, 3,Fine grinding and polishing - more info check here: http://www.buymeasuringtools.com/Plano-concave-lens-10217810/
Quick Brief
Place of Origin: China (Mainland)Brand Name: JiamijiMaterial: GlassUsage: OpticalStructure: Plano-concaveShape: SphericalShape: round