Please choose the number to decide which Diopter you want!Specifications:Material: GlassLens size: 5 * 4cm， 3mm (T)Box Size: 11 * 5.5 * 1.5cmAllow 1-3mm measurement errorDiopter: 1.00 / 1.50 / 2.00 / 2.50 / 3.00Features:For the replacement of black glass lenses on welding mask， eye protection， anti-glare， anti-UV;Suitable for protecting the operating personnel of welding， arc welding， plasma cutting;Have a significant effect to prevent the electric ophthalmia caused by arc and vitreous opacities and so on.Package include:2 x Welding Magnifier Lens(one box)