Complies with ANSI A156.2, Grade 2 (400,000 cycles), UL listed for 3 hr fire door, ANSI A117.1 American Disabilities Act (ADA). Door range of 1-3/8 to 2 in. Backset of 2-3/4 in standard. Strike, T-strike (1-1/8 in x 2-3/4 in) standard. Cylindrical, steel-coated with zinc dichromate (corrosion resistance). Latch bolt operated by lever from either side, outside lever locked by pushbutton on inside, unlocked by emergency release on outside, rotating inside lever or closing door.