OIC1477 Features: * Universal hole pattern to fit all Jackson adapters and headgear * Jackson offers a wide selection of windows to fulfill needs throughout the safety industry * Holds 2 x 4 1/4"" filter plate * Should not be used as welding helmet * Testing and approvals: * Meets or exceeds ANSI Z87.1 standards for secondary eye protection. Specifications: * Ideal for gas welding vs. goggle, the 39 provides excellent ventilation