Commercial Storeroom Ball Knob Lockset Heavy-duty commercial storeroom ball knob. Satin stainless steel US32D . Performance Complies with ANSI A156.2. Series 4000, Grade 2 400,000 cycles . UL listed for 3 hour fire door. Keying 6 or 7 pin SCC keyway with 2 nickel keys per lock. Door range 1-3/8 to 1-3/4 . Backset 2-3/4 standard. Strike T strike 1-1/8 x 2-3/4 standard. Cylindrical, steel-coated with zinc dichromate corrosion resistance . Latch operated by rotating inside knob or key in outside knob. Outside knob always fixed. Finish Stainless Steel, Function Storeroom, Type Heavy-Duty Commerial, Backset Size 2-3/4 In., Exterior Access Key, Interior Action Rotating, Strike Size 1-1/8 In. 2-3/4 In., Strike Corner T-Strike, Construction Tubular Steel, Security Grade Grade 2, Pkg Qty 1, Package Type Clamshell