【STANDARD SIZE】 This welding helmet magnifying lens measures 3.54" x 4.25". 【LIGHTWEIGHT】 Each welding magnifying lens weighs only 1.6 oz, without adding extra burden or inconvenience, and is easy to install. 【DURABLE】 Made of high-quality polycarbonate to prevent cracks and improve durability while reducing weight. 【WIDE COMPATIBILITY】Compatible with most ARCCAPTAIN welding helmets such as HSH-G999, LY800J, XK-LY800H, LY800Js, and most other welding helmets on the market.