Professional Titanium Optical Trial Lens Frame Eye Optometry Optician titanium frame Holds 4 pair trial lenses, with standard diameter of 38 mm Material: light weight titanium alloy & plastic Adjustable angle & length of side, and adjustable nosepads Smooth changeable cylinder axis twirls Quick and easy PD adjustment from 54, 56, 58, 60, 62, 64, 66, 68, 70