The Tell CL100051 Light-Duty Commercial Ball Passage Lock has a satin stainless steel (US32D) finish with a tubular construction. Its performance complies with ANSI A156.2, series 4000, grade 2 (400,000 cycles). It is UL listed for a 3 hour fire door. It has a standard T strike (1 1/8-inch x 2 3/4-inch). Latch bolt is operated by interior or exterior.