This Yale door knob series provides maximum security with ANSI grade 2 standard and tested at 400,000 lifecycles, and are ideal for heavy duty residential projects. The modern design of these door knobs with a choice of 8 different finishes suits most décor needs. Standard: ANSI / BHMA A156.2.2003 Grade 2 Testing Cycles: 400,000 cycles tested Function: Wide range of functions. Ideal product for heavy duty residental project Cylinder: Solid brass 6-pin tumbler cylinder No. of Keys: 3pcs of nickel plated brass key Master key available upon request Model No. BR, CA, CN Finishes: Polished Brass (US3), Satin Brass (US4), Antique Brass (US5), Antique Copper (US11), Satin Nickel (US15), Chrome Plated (US26), Polished Stainless Steel (US32), Satin Stainless Steel (US32D)