Connection Type : Bayonet Frame Material : Plastic Dimensions : 3.4 In L X 2.3 In H Suitable For : 3M 5000 Series Respirators, 3M 6000 Series Cartridges, 3M 502 Adapter, 3M 6000 Series Face Pieces, 3M 7000 Series Face Pieces With Bayonet Filter Holders