These lenses easily fit over your glasses to give you greater magnification and clearer vision. Use them for your favourite activities like sewing, crafts & hobbies, needlework, knitting & crocheting, reading & writing or any thing where magnification is needed. They easily clip onto the bridge of your regular glasses or your sunglasses. Flip them down for powerful magnifying glasses and flip them up when magnification is not required. Width - 12cm (5”). Height - 4cm (11⁄2”).