Polycarbonate Clip-on Flip-up Canary Yellow Enhancing Driving Glasses - Large True Rec - 60mm Wide X 38mm High X 128mm Overall Width or 2.36 Inches Wide X 1.50 Inches High X 5.04 Inches Overall Width - 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 ophthalmic lenses and prevent shifting and scratching Convenient one hand application to Prescription frames with positive indexing lens positions