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When you need simple, safe and dependable protection, there's no better choice than the 9K Series from BEST. The 9K is one of the toughest heavy-duty cylindrical locks on the market. With proven Grade 1 security, it's dependable and delivers superior security in countless environments. And with easy core interchangeability and a broad selection of functions, styles and finishes, the BEST 9K is ideal for retrofit and new construction alike.