Yale offers cylindrical and tubular options in medium duty door knobs. These door knobs provide ANSI grade 3 standard, offering a durable and economical door lock solution with classic designs that suit both residential projects and light duty commercial buildings. Standard: ANSI / BHMA A156.2.2003 Grade 3 Testing Cycles: 200,000 cycles tested Function: Residental and light duty commercial applicatoin 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 Finishes: Polished Brass (US3), Satin Brass (US4), Antique Copper (US11), Chrome Plated (US26), Polished Stainless Steel (US32), Satin Stainless Steel (US32D)