Experience optimal protection while welding with the Weldmark Filter Lens Shade 9, designed specifically for use with welding helmets. Measuring 5.25 inches by 4.5 inches, this rectangular lens is crafted from heat-treated, hardened glass, ensuring it is both optically correct and durable. It provides essential infrared and ultraviolet protection in accordance with industry standards, making it an ideal choice for a range of welding applications. With smooth rounded edges for added safety and comfort, this lens is an indispensable accessory for welders seeking reliable eye protection in demanding environments.