Co2 laser focusing lens, (18,50.8)(18,101.6)(19,50.8)(19,63.5)(20,38.1)(20,50.8)(20,63.5)(20,76.2)(20,101.6)(20,127)(25,63.5)(25,76.2)(25,101.6)(25,127)(25,50.8)mm
co2 laser beam expander 2x, 2.5x, 3x, 4x,5x This offer is for fixed cylindrical beam expander, this type expander classify to two shapes. Cylindrical tube cylindrical M22 screw