The SLB-80B-200PM from Laser 2000 (UK) Ltd. is a Optical Lens with Wavelength Range 400 to 700 nm, Focal Length 20.18 cm(201.8 mm), Center Thickness 10.8 mm, Diameter 80 mm, Radius 20.76 cm(207.6 mm). More details for SLB-80B-200PM can be seen below.