The Rockwood 2949.26D self-latching flush bolt with bottom fire bolt has a brass satin chrome plated finish (Rockwood/BHSM number US26D/626), is UL listed, and is used to secure a pair of wood core or composite 20 minute-rated fire doors up to 9 high x 4 wide. The flush bolt is installed in the door so that the latch lies flush with the doors surface. The top bolt is self-latching, and the bottom bolt eliminates the need for floor prep. It has an oversize strike hole to accommodate slight door misalignment. The thermal lock automatically locks the inactive door under high heat conditions due to fire. The top bolt measures 8-1/2" high x 1" wide and has a bolt head rod that is adjustable up to 1/2". The bottom bolt measures 13/16" in diameter. Base material is brass.
Rockwood Manufacturing Company manufactures door hardware. The company, founded in 1946, is headquartered in Rockwood, PA.