This Yale door knob range is recommended to be used on internal doors, with a wide range of functions like bathroom, passage, storeroom and more. Standard: ANSI / BHMA A156.2.2003 Testing Cycles: Guaranteed for 175,000 cycles tested Function: Entrance, Bathroom, Passage, Storeroom Cylinder: Solid brass 5-pin tumbler cylinder No. of Keys: 3pcs of nickel plated brass key Master key available upon request Model No. BR, CA, CN, OV, MY Finishes: Polished Brass (US3), Antique Brass (US5), Antique Copper (US11), Satin Stainless Steel (US32D)