-18 ga. cold rolled steel
-Mitered and welded corners
-Welded reinforcing clips at corners
-Counter-sunk mounting screw-holes
-#8 x 1-3/4" Phillips head SMS
-Available in uneven and fractional sizes
-Designed for 1-3/4" thick Doors manufactured within door industry tolerance of +/- 1/16"

-CERTIFIED by UL to CAN/ULC-S104 and ANSI/UL10B, complies with NFPA 80 and NFPA 252 for application to Hollow Metal fire doors rated up to 3 Hrs., and Wood fire doors rated up to 90 minutes.POSITIVE -PRESSURE - CERTIFIED by UL to ANSI/UL10C, complies with IBC, NFPA 80 and NFPA 252 for application to Hollow Metal fire doors rated up to 3 Hrs., and Wood fire doors rated up to 90 minutes.