Jackson Safety Model K headgear and window Kit, easy to adjust ratcheting headgear; Includes uncoated PETG style window (replaceable). features a unbound shape D window. Meets ANSI Z87.1-2010. Established in 1933, A Jackson Safety has built a century long reputation for delivering the most innovative safety solutions in the welding and personal protective equipment industries. When it comes to providing safety solutions with long-lasting value, durability and comfort, Jackson Safety has set the standard. Whether the need is for welding protection in a steel fabrication environment, head protection on a construction site or hearing protection at an airport, Jackson Safety provides the widest range of safety choices to meet the needs of every job and every worker.