The SLSQ-50.8B-120P from Laser 2000 (UK) Ltd. is a Optical Lens with Wavelength Range 546.1 nm, Focal Length 12.15 cm(121.5 mm), Center Thickness 8.7 mm, Diameter 50.8 mm, Radius 11.04 cm(110.4 mm). More details for SLSQ-50.8B-120P can be seen below.