Mechanical, Knob, Cylindrical, Lockset Function Passage, Lockset Grade 2, 4600 Ball Style, Bright Brass Lockset Finish, Keyway Type None, Key Type Not Keyed, Standards ANSI A156.2, Series 4000, No, Lockset Fire Rating 3 hr, Backset 2-3/4 in, Ligature No, For Use With Steel Doors and Frames, Wood Door with Wood or Steel Frames, Item Knob Lockset, Knob Material Wrought Brass, Lockset Performance Strength Medium Duty, Required Door Thickness 1-3/8 in and 1-3/4 in WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)