Replaces damaged or worn head harnesses. Maintains the appropriate level of protection and comfort. Specially designed for use with 3M ™ reusable half masks of the 7500 series. Quick and easy placement. Increase the life of your equipment. The 3M ™ 7581 head harness assembly is a quick and easy replacement part. This kit is specially designed for use with the 3M ™ reusable half masks of the 7500 series. Make sure you have the right level of protection and work comfortably with the 3M 7581 head harness assembly. It is easy to attach and helps increase the life of your half mask of the 7500 series. This set replaces damaged or worn harnesses, and is specially designed for use with the 3M ™ reusable half masks of the 7500 series.