Master Lock 497A Heavy Duty Safety Tags feature durable polyester laminate to resist water, grease and extreme temperatures. • The heavy duty construction withstands over 50 lbs. (23kg) of pull force to meet and comply with the OSHA lockout/tagout standard. • 7/16in (11mm) diameter brass grommet accepts all safety padlocks. • Tags are customizable with name, department and expected completion date.