The DLB-25.4-100PM from Laser 2000 (UK) Ltd. is a Optical Lens with Wavelength Range 425 to 675 nm, Focal Length 10.02 cm(100.2 mm), Center Thickness 7.7 mm, Diameter 25.4 mm, Radius -138 to 61.4 mm. More details for DLB-25.4-100PM can be seen below.