The Bausch & Lomb 20X W.F Widefield Microscope Eyepiece No. 310563 is a high-quality eyepiece designed for use with microscopes. It features a 23mm eyepiece diameter and 20X magnification, providing clear and detailed images. This eyepiece is part of the Bausch + Lomb brand and is a popular choice for medical and laboratory applications. New old stock. Winner pays 5.95 S+H