Door Bottom, Mill Finish, Insert Size 11/16 in, Flange Height 1 1/8 in, Width 1 3/4 in, Length 48 in, Projection 11/16 in, Insert Material ECO V Bio Based, Color Aluminum, Performance Heavy Duty, Insert Color Black, Flange Material Aluminum, Hardware Included, For Use With 48 in Wide 1-3/4 in Doors, Standards Air Infiltrated ASTM E-283 Rate of Leakage, Certified Green Guard Gold, Sound Tested ASTM E90, UL Fire Rate 10C Posative Pressure, UL Fire Rating UL10C