3M HF-801 SECURE CLICK HALF MASKUOM: Each Description: 3M Secure Click Reusable Half Face Mask HF 800 Series is available as two versions, HF 800 and HF 800SD. The HF 800SD versions have a speaking diaphragm. Both versions are available in three sizes. 3M Secure Click HF 800 Series Half Mask Reusable Respirator helps protect against particulates and a wide variety of gases and vapours when used with approved 3M Secure Click cartridges and filters* Greater breathability and comfort