The Tolsen 55161 is a tubular door knob lock designed for interior doors, providing a reliable way to secure your private rooms. It is crafted from an aluminum alloy and finished in antique brass, which gives it a classic look that blends well with traditional home decor. To ensure the finish lasts, the surface is treated with a multi-layer wear-resistant coating that helps it withstand the frequent touch of daily use. This lock is built for versatility, fitting doors with a thickness between 35 and 45mm and supporting a backset of 60 to 70mm. The assembly features a 51mm diameter knob resting on a 65mm rose, creating a balanced proportion on the door surface. Inside, the mechanism relies on a brass cylinder for durability, and it comes with three matching brass keys for your convenience. Because it uses a simple rotation mechanism, you will find it easy to operate and maintain over time.