2PCS D8 Glass Double-Concave 20 Times Beam Expander Lens Diffuser

Design wavelength 650 nm Diameter: 8mm Center thickness: 2.6mm Focus light shape: beam expansion Uses: mainly used for semiconductor focusing etc. Name: 20 diffusion lens colour:As shown Material:glass Package Contents: 2 x lens Only the above package content other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.