Overalls safety sign This sign endorses the utilization of protective overalls in the work place. This sign can be used in conjunction with (ZM 7) Foot and Leg Protection against Crushing safety sign. This sign is often used to inform workers and visitors on specific sites as to what PPE is required upon entering a Construction site, mine or a workshop. This sign can be used in conjunction with various other safety signs, eg (ZM 3) Head Protection, (ZM 5) Hand Protection, etc depending on what your requirements are.