Diameters Available:2mm to 600mm Diameter Tolerance:+0.00/-0.02mm or customer design Surface Quality:10-5 Surface Irregularity:/10 @632.8nm or customer design Thickness tolerance:+0/-0.02mm Clear Aperture:>90% of Diameter Chamfer 0.05-0.5mmx45degree,according to customers needs. Centeration:3 arcmin Coating :Single Mag2, Multiple Layers AR Coating. A:350-650nm B:650-1050nm C:1050-1585nm D: Customer Design