4 Point chinstrap replacement part compatible with Sentry III hard hat and various other Jackson Safety Hard hats. This replacement 4-point chin strap is compatible with Jackson Safety Sentry III hard hats which, when combined, meets ANSI Z89.1, Class C, G and E standards. Established in 1933, 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.