Material:Glass Usage:Optical Structure:Double Convex Shape:custom Surface Quality:40 20,60 40,80 50,10 5 name:Srical and asrical Lenses Application:Optical Diameter:0.8-200.0 mm High Refractive Index:1.8~2.0 Delivery Detail:15-20 workdays Packaging Details:Green Safty package Coating:MgF2, A R,or custom surface radius accuracy:+ -0.1mm