Wedge is an optical element having plane-inclined surfaces, usually the faces are inclined toward one another at very small angles. Wedges divert light toward their thicker portions. Specification of our wedge prism as follow: * Material: BK7 or( JGS1 JGS2 JGS3) * Glass Qualityz: nd+ / -0.001~ + / -0.0001 vd + / -0.8% ~ + / -0.1% * Dimension Tolerance: + / -0.20mm~ + 0.01/ -0.01mm * Thickness Tolerance: + / -0.20mm~ + / -0.005mm * Surface Quality: 80-50~ 10-5 * Surface Flatness: at 632.8nm lambda~ lambda / 20 per 25mm * Clear Aperture 80% ~ 100% * Angle Tolerance 3-5 minutes~ 3 second * Chamfer 0.3+ / -0.20mm x45degree * No Chamfer * Coating Optional