Heavy duty storeroom function – great for mechanical or supply closets, always need key to enter, free to exit. Cylindrical, steel – coated with zinc dichromate (corrosion resistance). 1-1/8-in x 2-1/4-in, square corner faceplate. Square corner 1-1/4-in x 4-7/8-in ANSI ASA strike. Complies with ANSI A156.2, Series 4000, Grade 2.