The CLB-1570-40PM from Laser 2000 (UK) Ltd. is a Optical Lens with Wavelength Range 400 to 700 nm, Focal Length 4 cm(40 mm), Center Thickness 4 mm, Radius 2.076 cm(20.76 mm), Edge Thickness(ET) 2.6 mm. More details for CLB-1570-40PM can be seen below.