Shade Control D-clips Polarized Clip-on Flip-up Plastic Sunglasses - Oval -54mm Wide X 48mm High (122mm Wide) - Polarized Grey Lens - Shade Control D-Clips New lower profile squeeze to open clip New leg profile to fit both metal and plastic frames All metal alloy construction - virtually unbreakable clip mechanism Legs have proprietary coating to protect ophtalmic lenses and prevent shifting and scratching Convenient one hand application to Prescription frames with positive indexing lens positions