The CLB-2030-250N from Laser 2000 (UK) Ltd. is a Optical Lens with Wavelength Range 546.1 nm, Focal Length -25 cm(-250 mm), Center Thickness 3.6 mm, Radius 12.975 cm(129.75 mm), Edge Thickness(ET) 4 mm. More details for CLB-2030-250N can be seen below.