Antiligature Lockset, Cylindrical, RX Series, Knob Style, Satin Stainless Finish, Function Classroom, Keyway Type Schlage C, Grade 1, Material Brass, Steel, Zinc, For Door Thickness 1-3/4 In., Backset 2-3/4 In., Crossbore Size 161 Prep, Number of Keys 2, Pins 6, ASA Strike, Cylinder Standard or IC Core, Standards ANSI, UL, ADA, Fire Rated 3 hr., For Use With Wood, Steel and Fiberglass Doors, Includes Screws TownSteel Ligature-Resistant Knob Locksets, Grade 1Nonhanded lock design impedes ability to attach laces, cords, and clothing to the knob. Heavy-duty lock chassis is constructed from wrought steel. For use in healthcare, detention centers, and other high risk facilities such as behavioral institutions.ANSI/BHMA A156.2 Series 4000. UL Listed.Backset: 2-3/4" Strike: ASA Door thickness: 1-3/4" UL Listed for 3-hr. fire door