Knob Lockset, Cylindrical, Light Commercial, BD (Ball) Style, Satin Chrome Finish, Function Storeroom, Grade 1, Material Cold Forged and Cold Rolled Steel, For Door Thickness 1 3/4 to 2 In., Backset 2 3/4 In., Crossbore Size 2 1/8 In., Keying Different, Number of Keys 2, Pins 6, ANSI 1 1/4 x 4 7/8 Strike, Cylinder Included, Keyway Type Arrow A, Key Type Nickel Silver, Listed for fire doors up to and including 3 Hr., Federal Specifications FF-H-106C, Fire Rated 3 Hours, For Use With Hollow Metal and Wood Doors