6-point ratchet suspension replacement parts are compatible with Jackson Safety* Sentry III hard hats, giving them extra longevity. These safety hats help provide on the job protection your workers. The hats are intended to reduce the force of impact that could result from a blow to the top of the head and the low profile, silhouette styled safety hats meet ANSI Z89.1 - 2009 requirements for impact (as well as Class C, G and E). The ratchet suspension system will fit head sizes 6.5 to 8 in and Sentry III hats have accessory slots for attaching additional compatible personal protective equipment. When you need to protect yourself and your team, trust Jackson Safety* Sentry III hard hats as your first line of defense against potential head hazards.